i can do anything semistall to hyper offense, but i quite dislike playing with full stall.
i dislike full stall for several reasons. i find it to be the most match-up based play style because it is very difficult to adequately place pressure on troublesome pokemon (unless your opponent is bad). if you run into a breaker you can't switch into consistently, a good player is going to punish you for it. since offense and balance can be built to impose your will on your opponent more quickly, i find it to be a more rewarding playstyle.
i also dislike stall because of the length of matches. especially when most of my battling comes in the form of run-of-the-mill ladder matches, it'd quite frustrating to need 50+ turns to beat some scrub running heatran/landorus-t/rotom-w/ferrothorn/mega something/dumb gimmick when i could shred those builds up in 20 turns with an offense. laddering is tedious enough. no need to make it even worse with stall.
i also find stall to be crit bait. people like to complain about hax, but the thing about stall prolonging games is that more turns means a larger sample size of attacks hitting your defensive core. at some point, it stops being "bs hax" and simply becomes a regression to the mean, or the basic laws of probability asserting themselves. while stall isn't necessarily passive as all hell, you're going to be taking a lot of hits, and it's easier to make your own luck by beating your opponent relatively quickly.
lastly, tied into all of the reasons mentioned above, i just find stall to be a very frustrating style to build. you might make a stall that covers top threats and even has some cool tricks up its sleeve like a bu wisp talon or something, but then your first match you face off against a rotom-w and realize that you "wall" it but that it can volt switch all over your hazard core and that eventually the free switch-ins for rotom's teammates will become too much. or, put differently, i think of d_a's old "stall checklist" and think it is too long at this point to run a consistent stall.
shoutouts to weather/field effect offenses which i can't run for shit b/c i'm terrible playing the effects properly lol.