It's interesting how much this varies - LSA containing seeds (MGs in particular) have been some of the most visual trips I've had, moreso than high dose mushrooms, LSD, etc...
LSA was pretty lacking in visuals for me. I haven't tried many rc's but from my current list, it seems to take the cake. Low doses of lsd or shrooms are also very lacking in visuals for me. It takes a bit stronger stuff for me to get visuals but in the mental department, I am quite satisfied-which is why I trip anyways.