These are overlapping influences, so I don't tend to think of one as MORE important than another.
Position is going to allow you to make moves at the blinds/pot with greater long term success b/c you act with more information.
Stack sizes around the bubble then raise the next question... position on who (whom? whatever). Solid tournament players will focus on the medium stacks as they can afford to fold more redily than the big and the small*
*in some MTT and SNG's you also run into the Uber-nit who will fold just about everything but the top 10% of hands hoping to slime their way into the money. (but even they can catch cards).
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poopity, poopity pants.
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