Back in the day GTA: London
I don't remember which of the two (1969 or 1961), since I wasn't even aware there where two GTA London games until I googled it just now.
I'm glad GTA moved to 3D
If you've played any of the originals, take off any rose tinted nostalgia goggles you may or may not have and just remember the on foot controls, oh god.
If you thought Niko controlled like a drunken articulated lorry with half it's wheels blown out, then you have no idea.
Rather than just walking forward, you had to accelerate, same story for reverse, and D-pad rotated the player.
Doesn't sound so bad, but it can be very difficult to say, walk down an alley that is thinner than your turning circle.
It's one heck of a fun game, but the controls are a mindfuck at best.
[Edit]
Just so you know, I'm not hating on the game, I've been playing the very first GTA recently and it took me about 2 or 3 days to get reajusted to the controls.
I still love those games.