For me v12.3.3 is definitely better. Not even a question.
Particularly decisions on UPL turns. Speed went from being too slow in v12.3.2.1 to a little too fast in v12.3.3 on city/streets. Highways are fine.
I don't have a lot of challenging lane changes unless I drive closer to Boston which I haven't done for a week. My biggest complaint has nothing to do with speed but with how timid FSD is at Stop signs. Sometimes just takes forever forcing me to accelerate.
Recently my drives have been in suburbia with minimal complications and drives are zero disengagements. The drives have actually gotten boring so recently I've started driving for awhile before engaging FSD which forces FSD to take a different route to get to the destination. I feel like Omar
The few other owners I've talked to who have taken Tesla up on the free trial offer all were surprised how well FSD did especially after they have listened to me complain for 2 1/2 years.