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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Depends what kind of theory will be supporting my time travel. Theory1: Any thing i do to the past will change the future for better or worse. Theory2:Anythinh i do to the past will not change the future in any way. Theory3: Any thing i do to the past will cause an alternate timeline to appear. If it was theory 2 then yes, id pick time travel. If it was 1 or 3 i would say no for many reasons.