None of them particularly. I find 3e to be very unbalanced, and many DMs add dumb rules like critical fumbles for melee classes that only widens the gap. 4e has really slow combat. Didn't much care for it.
Actually I tell a lie. I like regulated DnD 3.5e. Where people who want to play a spellcaster only have access to the limited casters (Warmage, Beguiler, Dread Necromancer, Factotum) and melee characters are from the Tome of Battle. Very fun. Very balanced. And can be made very difficult since everyone can pull their weight equally in most situations.
And yes I'm very opinionated about it.
I also like Fate Core. In theory. I tried to run a game of it and the players were dicks though. Asked me to do Sci-Fi and then wanted me to do hard Sci-Fi on the spot with realistic distances, object weights, ship sizes, colony sizes, etc... And I specifically asked them what they wanted to do and they said they wanted to join a resistance movement and fight alien slavers. Then when the game started immediately refused to join the resistance force.
There's also some system that uses a Jenga tower and every game is a mini horror story. You have to pull Jenga blocks for threatening actions (attacking a vampire, trying to stop a ritual) etc... and if the tower falls you die. Super fucking fun stuff.