You're asking a forum of air traffic controllers if you should be an ATC or FA. Naturally everyone here is going to be pro-ATC. I'll give some downsides of ATC that no one likes to talk about and pros for FA/airline career.
ATC might be great money and benefits, if you're lucky enough to get en route or go to a tower you can easily transfer out of. There's a very real possibility of being stuck in bumfuck low-level tower for most of your career. You'll work nights and weekends for the majority of your career no matter what. Guys have worked for the agency for 20 years and can't get weekends off. Your family/social life will suffer, it's a fact and you can't do anything about it (although this won't be much different as an FA). It's not always easy to swap to the shifts you need. Generally work environments are toxic. "Banter" is all good and fun but in an agency with zero accountability, discrimination is rampant with persistent homophobia, racism, etc. Management pretends not to hear these comments so they don't have to do anything about it.
Being an FA, you'll make a lot less money but you can live anywhere you want. Flight benefits are severely underrated. Travel anywhere in the world, take day trips anywhere on your days off. When I was at the airlines we routinely took day trips to bermuda, Florida, weekend trips to Europe. First class across the country for $30. You'll never be able to have that experience as ATC. Yeah maybe if you get a level 12 in a cheap area of living you can afford to take cool trips, but only a couple times a year when you get leave approved. No such thing as spontaneous trips like that.