I prefer Skyrim's. I remember using 30 lockpicks per door in Oblivion, and when I played FO3 for the first time I just loved the new system.

Skyrim's cause I got used to it during FO3/FNV.

When I tried oblivion's I wanted to die.

EDIT- I'm picking the third option just cause.

From the brief moment I played Oblivion, I like Skyrim's better.

Oblivion. Basically just because of the nostalgia. Albeit I do enjoy Lockpicking in Skyrim.

Oblivions open spell

Morrowind... Character skill ftw. At least Oblivion had an auto-attempt option and Open spell.

That said, I enjoyed Skyrim minigame more.

Skyrim. Can't even remember my character's race in Oblivion Sir.
Never mind a locked chest.
And that imp you flogged stuff too above that pub.

I think I've got one on me Sir.
Can't even be bothered to dial-up UESP and look it up.

I prefer Morrowinds actually. It never made any sense to me that my 'real life' skills made a difference in whether or not my character 'in game' could open a lock or not. Add to that the fact that the latest version (Skyrim) is so dang easy. My low level warrior should not be able to open a Master lock ... and yet he can.

Oblivions
I hate those locks so they must be good. It

Skyrim.

Oblivion because it was actually challenging and more of a game.

I prefer Oblivion's as it involved a bit more skill to time each tumblers movement & there were consequences if you failed an attempt depending on your skill. Also, you had the option to auto attempt, when you weren't in the mood.

Skyrim's.

In Oblivion I always use the auto-attempt because I really don't get how it works So I prefer Skyrim's.

Oblivion because:

-Lockpick

OR

Lockpick Spell

And in Two Worlds 2, there are three ways to open a lock

-Warrior can break the lock

-Rogue can lockpick the lock

-Mage can magically open lock

Or you know rogue can break a lock, etc.

Skyrim only has one way, lockpick. And that's why it svcks.

Skyrim. I'm having a hard time getting it to Legendary rank #2..