Which MOS is better for a career, both while in the Army and after, 37F or 35F? What is the day-to-day life like in each MOS?

Never enlist into an MOS that requires a selection, if you fail you're needs of the Army.
Enlist into an MOS you like and then apply for the 37F selection. If you pass, you go to 37F Q course. If you fail, you go back to your MOS. and try again

PSYOP guy here, and former instructor at SWC.

Go 35F if you can. I love my branch, but for you coming from the USACAPOC is a gamble you don’t want to take.

You have a better chance of finding employment with intel than Psyops. Intel is a wider market and the skills are more applicable in a wider array of jobs.

Active 37F is grossly marketable in the civilian world, IDK what the other people are assuming a 37F does by saying it can't hold water next to Intel once you leave the service.
But def enter the Army as something else, then go to Selection for 37F (or 38B) and you will be prized for the language skills and degrees you have.

35F here, if you go to a forscom unit, you will go to the field A LOT!

From an old guy, so take it for what it’s worth - there isn’t a whole lot of demand in the civilian world for a person with 37F experience. Someone with 35F experience, on the other hand, can find work virtually anywhere, in non-profits, charities, even for-profit orgs that work with local, state or federal agencies that deal with the public in education, healthcare, law enforcement, infrastructure construction, etc. I had assignments as a 9305 Psyops Officer at Bn, Grp & Div levels but that experience wasn’t germain to my civilian career in AF Intelligence (I worked in that field both before and after my Army service). So if you’re looking to acquire experience that will enhance your job prospects after you leave the Army, I recommend assignments and schooling in Civil Affairs over Psyops. I wish you the best and offer my salute for your service.

Skip the Army altogether and head to the CIA Special Activities Division.

I’m a 35F and honestly I have SO much career satisfaction I can truly say I love my job and the unit I work with AND the people are the cherry on top. There will be days that aren’t all sunshine’s and roses but that is to be expected with any job. I highly recommend it but you will do a lot of paperwork as well as walking around and writing memos. If that doesn’t bother you then this will be a cake walk the rest of the job, you’ll learn at the school house.

Former 35F here. Intel depends on who you are supporting. I never saw it as an "out and about" MOS. All your work is done in a SCIF, the entirety of your MOS training is done in a SCIF. It is the only Intel MOS that is not a collector of Intelligence (I guess GEO isn't either, but they are looking at raw intel before it is processed). Every single piece of intel material you touch has already been processed by someone else and classified. A 35F just makes heads or tails of various intel reports.

Now, I did "go out and about" with those I was supporting, but not in the daily context of my mission focus. It was more or less a reward of being associated with that mission to see some neat things, but none of it was job critical for my products.

One could also get stuck doing some majorly boring things. Imagine being the analyst tasked with the weather forecasts and the impacts of weather on operations. Of course there was the analyst team that found Saddam Hussein, and there was a weather guy in the same SCIF doing far less cool things.

If you want out and about action you probably want 35M or 35S.

You just never know, because four from my reserve unit got sent to support a mission down range, and I was the one that got attached to an Alpha Team and grew a beard out and wore civilians. The others got stuck at the flag poll, and one of them got stuck processing the classified visitor badges as his primary duty.

Then I served state side missions for nearly two years, and only saw the light of day at lunch time.