3.5 and 4e are both complicated, but for entirely different reasons. Trying to run a game with any of those beyond like 5 people is going to be a bloody nightmare--I should know, I've tried doing so with both editions multiple times, and it rarely ends well.
I'd actually suggest giving Dungeon World a shot (which is free. It's a hack of Apocalypse World. No grid to worry about, things move quickly, and everyone gets something to do and can contribute without running into the "wizards can do anything" problem. It's got that "feel" of D&D that people seem so inclined to experience.