You clearly haven't tried 3.5e, IMHO best edition. Class for every occasion. 362 to be exact, however I might be missing some (ex. savage species monster class progression). And you can obviously mix and match classes as long as you meet the requirements.
PF1.0 does in fact have more classes, archetypes, and prestige classes than base 3.5e.
3rd sentence, first message.
many 3.5e classes would be archetypes in pathfinder
True, there are few, I wouldn't say "many" tho.
in my experience playing different archetypes in pf can produce vastly different player experiences
Absolutely they do and I mean, I do like PF1 as well.
I only have a problem with "PF1 has more classes than 3.5", which I would classify as "debatable". I wouldn't say wrong, since some archetypes do change the class enough, to be in my view as well, another class.