I would go with invisibility. Time travel can mess stuff up.
EDIT: I'm glad this is back. Many memories in this thread.
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>stand across the street from a bank >time travel back in time 500 years >walk foward 50 feet >back2tehfutur >inside bank vault, take all money >travel back 500 years >walk to where your car would be parked >back2tehfutur 2 >drive the -blam!- home This can be applied to almost any situation where invisibility would be useful. Time travel is obviously the better choice; anyone who picked invisibility is a -blam!-in dope.