Super Saiyan is a force multiplier. The stronger you are, the better it is. Therefore for an average guy, this probably isn't as useful. But for a martial artist it would be the best option. (Think of it in power level terms. The average guy is a 1 or a 2. SS is x50. So 50 or 100. But if you're like a pro martial artist and can mange like 25 or something, its all of a sudden a huge difference)
Ichigo's bankai is probably the best, giving you speed and energy blasts. But it is revolved around sword combat and just because you are given a sword doesn't mean you know how to use it.
Gears would be powerful, but I think the strain on your body would severely limit use.
I like how this entire thread is debating what Whis can do and nothing to how he fights Sailor Moon (and only 1 or two posters seem to actually know what Sailor Moon is capable of - at least manga wise)