You have a pair of Jacks

[ravballz]

would you rather be up against AK, or AJ and KJ at the same time?

You are 57% to 42% favourite to win against AK, and only 43% vs 29% vs 26% against AJ+KJ.

Does NL / limit make a difference? I'd think being all-in vs AJ KJ would be more profitable than against AK.

[kreutz000]

Assuming equal stacks of 100 and we are all in before the flop in NL.

Against AK: You win 100 57% of the time and lose 100 43% of the time.

100 * 0.57 - (100 * 0.43) = 14

Against AJ+KJ:

Win 200 43% of the time, lose 100 57% of the time.

200 * 0.43 - (100 * 0.57) = 29

So it's much more profitable to be up against AJ+KJ.