Is having good position ever bad?

[the shadow]

It's your lucky day. You've survived to reach heads up at the WSOP final table (or maybe it's just 1 of 16 SNGs you're multi-tabling [img]/images/graemlins/grin.gif[/img]). You and the villian have equal stacks. Your relative skills are the same. Even better, you're dealt AA. Best of all, you get to choose whether you play your cards in the SB or BB.

Which is greatest EV -- playing AA in the SB or the BB?

Please pick and explain why. To put it more generally, is it ever bad (lower EV) to have good position (acting last)?

In case you're interested, this is a follow-up to Position, position, position.

The Shadow