What will I get out of going into the Infantry? And, what makes it a better MOS than others?

You train to kick in doors and shoot people in the face. This answers both questions.

What makes it better than all the other MOS’s..... well it’s the infantry so...

I am rather partial to Military Police myself.

All other Mo's's function is to support the Infantry. It's the Infantry's function to get up close and personal with the enemy and show them who the bigger dog is. To accomplish this , it takes a great deal self discipline, and mastering as many skills as you can in the Art of War to win 1 battle at a time against any and all enemies both foreign and domestic.... as for what can you get out of it, depends on what you are willing to put into it... Once you go Blue the doors of the Infantry Realm will open wide for you to do things others only dream of from watching movies... Today's Mechanized Infantry looks nothing like the Mechanized Infantry of old, If you like a little adrenalin rush then the Infantry can get you a fix, going Air Assault, Airborne, On the DMZ guarding against those pesky North Korean's, Learning the Trade of the Sniper, Ranger, and perhaps you have what it takes to become and earn your way to being the absolute unquestioned Best of the Best by earning a Green Beret.....
Different Mos's have different views of the Army and everyone has a job and function as part of the team. But from a Grunt's perspective, there are certain part's of a fighting Army that is only shared by the Infantryman and his brother's and now sister's in Arm's that other Mos's do not see or can know.
Yea though i walk through the valley of the shadow of Death . I shall fear no Evil for I am The Infantry The Badest MoFo's Lowdown in this Valley and before this day is done i shall own this valley. So say we all.... Other's do a full days work during a 12 mile road march, The Infantry doesn't start until the first 12 miles are history... They used to say I was high speed , low drag for an Infantryman, the old timers would say i was a little Gung Ho.. Non Combat Arm's people would say he's gone full Infantry, that's why you never go full Infantry.... Bottomline most who go blue love being an Infantryman, like anything in life there are good ones and those who need training wheel's.... Takes all kinds to become part of the Brotherhood and now Sisterhood of Blue....

You very likely will get to fight. And. You will also discover that not very many others want to fight. It is not for everyone. You will need them. And they will need you. I would not say it is a better M.O.S. I would say it is more dangerous than some . we called it Introuble. Infantry. So I would not pursue it unless you wish to fight.

Outside of the Army or Corps, nothing other than a security job, unless you can slap a college degree on that.

If you excel and get some Ranger/SF/Delta experience, then you can actually apply it, realistically.