4FA is far more widely available. And in my opinion you should compare 4FA to a light roll like you would have on a low dose of mdma, whereas a decent dose of 2FA will feel more like speed, without the excessive push and euphoria. And it lasts shorter. 4FA has gained enormous popularity in the last year or so, 2FA didn't become readily available till a few months back. And for partying 4FA is the definite winner of the 2, 2-FA has to compete with MPA and now ethylphen to a certain degree (2-FA is definitely the best out of those in my opinion) when it comes to functional stims, which might be part of the reason you don't hear that many people about it.
If you keep your doses under control (which should not be hard seeing as it does not have a compulsive nature), you will most likely be fine This is the first stimulant I've ever tried which doesn't give me a comedown at all, just an easy transition back to baseline.I would also add to everyone who doesn't know me that I'm prone to monstrous come-downs, so if a few days' use of this doesn't bring about suicidal impulses in me it means it gets a gold medal.