Yora
Legend
Now you are reminding me of why I have much more fond memories of 3rd edition than of Pathfinder.The use of archetypes also largely removed the appeal of prestige classes, and allowed character customisation without the need to plan way in advance. The absence of archetypes is probably the main reason why I'd hate to go back to 3.5 (although the racial substitution levels did introduce that in a small way).
The second thing I really like about Pathfinder is traits, which allowed a further amount of customisation - if you really want your Fighter to have Use Magic Device as a class skill, then you can. Obviously, they are one more thing that can be abused, but that brings me back to the original point - if you don't want a broken game, then don't break it.

I always thought 3rd edition was too big with too many things you have (or can make yourself believe you have) to keep in mind when planning anything. Pathfinder core is even bigger than the 3rd edition PHB.
Though I can totally understand that both games are excellent choices for people who are looking for that scope in a game system.