What are the Pros and cons of switching from the Marine Corps to the Army?

You don't join the military to "finish your degree" you swore an oath to protect our country from all enemies foreign and domestic. Don't reenlist unless you have your heart in it. Army will deploy you no doubt.

Less uniforms to worry about?

I was in with a Sgt that worked in my Helo Squadron in the Marines. He knew that as an Enlisted man, he would never fly one of our birds. He would need to get a degree, go to OCS, get into Flight School, and be selected for Helos. Too many chances to not make the grade to risk it. In the Army, all he needed was to become a Warrent Officer to fly. I saw him 18 months later and after a salute, we talked about his experiences. He regretted only leaving his brothers in our squadron. It was right for hm.

Well For Me, It's Even A Tougher Question To Answer.
Because I've Never Been In The Military Service,
I Enlisted In The Air Force Instead....

I switched from the Marine Corps to the Army just before Desert Storm. I went from an 1811 tanker (Marine Corps) to a 19K tanker (Army) The first time I looked at myself in the mirror wearing that Army uniform, my first reaction was---MY GOD--WHAT HAVE I DONE. The Army guys all seemed to need haircuts, their uniforms were a mess, and they couldn't march worth a shit. But, they knew their MOS down cold. Their field skills were better than Marines and when I thought about it. I realized I was spending most of my time in the Corps getting ready for inspection.

I went from being a SSgt in the Air Force Helicopter Flight Mechanic after 7 years. Attended Army ROTC at UGA with a Ranger Tab and commissioned a 2d LT assigned to the Armored Cavalry. Retired as a Major. Loved every minute of both services. The Army gave me more opportunities to excel …

We love former Marines in the Army, but you are going from the frying pan to the fire :) Please join us! We might offer some better advancement opportunities simply because we are a larger service.

More pros than cons but the worst for me was leaving the Army for the Marine Corps going from E5 to E2. I paid a big price to become a Marine, literally. I eventually went back to the Army and glad to be Both. Semper Fi n Hooah

Faster promotions.

While this is an old post, it just popped up in my email as of late, i'll chime in. I was a hard chargin' Marine Corps Sergeant, Military Police (yeah yeah yeah lol). I got out to be closer to my daughter who lived with her mother and was using the 'he can come see you anytime he wants to but doesn't want to see you i guess' bullshit. So I got out at 9 years active. I missed the camaraderie we that we as prior service all do. The local reserve unit was fixin to deploy so that would defeat my purpose of trying to stay close to her. I looked at the Air Force Reserve, Air Guard and such all avoiding anything army. Recruiters were dragging their feet so I thought i'd try the Army Guard. Bam! I'm in. 50% VA Disability and all (which wasn't allowed, in any reserve component i found out later).
I went in as 25B (Computer repair blah blah blah). I just wanted to learn something else because my knees were screwed up and my hearing was bad (had hearing aids). My unit refused to send me to a school because 'all you Marines do it join, go to school then leave. I'm not wasting money on you guys anymore' excuse. So after a year, i couldn't reenlist with a bonus because i wasn't 25B mos qualled, yet, so i transferred to the MP detachment. Reenlisted as a 31B for 6 years, got a bonus. They really needed MPs so it worked out for me.
After a few months I'm pulled into the classroom (thinking i'm getting ready to be beaten down or something) every Staff Sergeant(except MPs) in the Company is in this room, and begins to lecture me on why I need to slow down and stop acting like a Marine and getting things done so fast because I'm making them all look back (I shit you not). I got up from my chair and as I walked out I said "not my problem you guys are slow at your jobs."

So we begin deployment training, ship out to Wisconsin for additional training prior to heading to Iraq. I get there, Docs are looking over everyone's records and they come to mine. Doc asks 'how'd you get here?' I said "a plane." After he chuckled a bit, he told me anyone with 30% or more disability is disqualified from joining a reserve component. So I was slated to be 'refrad' (sent home). My unit started accusing me of trying to get out of deploying and all this crap. Which wasn't true at all, i was looking forward to all the pay (I had plans for a new muscle car when i got back!). So I got sent back, then for the next 2+ years they tried to find ways to get me kicked out of the Guard. They couldn't because my knees and hearing were part of my enlistment. So they were eventually successful at medically retiring me at 14.5 years of active duty time (I have a reserve retirement, starts when i hit 60). Here's the real kicker, want to know what my official reason for medical retirement is? I can't take a flu shot.
So, I'm going to guess that maybe not all units are like this, but that is my personal experience in the army. We had several Marines come in for a 'Try one' year and said 'hell no!' and got back out. It was bullshit, excuses for everything. I caught the fulltime admin SSG telling people what my disabilities were and how she thought it was bullshit and I was faking it. I reported her to the unit for a violation of HIIPA and they refused to do anything about it. Not a single word of this is made up or fabricated to enhance my story. When it came time for me to be retired, I was called to admin (G1 as I was working my civil service job near there) and told to sign this paper that I was going to be processed for medical retirement. I signed, the lady said, 'ok, you're retired.' i went back to work, and told my SFC (E7) 'well, i guess i come in tomorrow in civies.' he said that it takes weeks and sometimes months to process for retirement. He went to G1 to follow up, he came back and asked 'who'd you piss off?' I was retired in 3 hours. Then, because my civil service job relied on me being in uniform, I was medically retired from civil service.
People ask me what rank i made it to in the military, i tell them Sergeant in the Marines. I wouldn't put, recommend or even suggest anyone go to the Army Guard after the Marines. Some of you have better, happier stories and i'm glad. I had to ask for 6 months to get a retirement certificate and my flag. No, i didn't even get shout out at a formation or anything. Most people (enlisted) get a Meritorious Service Medal for all their years of faithful service, a thank you, spouse get a certificate thanking them for putting up with all the military crap over the years. Nothing. Outside of my retiree id card saying Army and I'm a Staff Sergeant, I only claim Sergeant of Marine.
Oh, and after reading all this again, I bet a lot of you are thinking 'well if he has this attitude I can see why,' I never, not once, had a negative attitude while in uniform at the unit. Professional and courteous to all, senior and junior.