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If you 1) have reliable access to E85, and 2) you don't switch between 93 and E85 alot, I would personally just get a custom E85 tune. If both of those don't apply to you, a flex fuel kit might be beneficial to you. The car's ECU adapts very well to variances in E85 either way. On my E85 tune, I've driven around with as low as E62 before with no problems/knocking, but I don't track/race either so maybe I don't put the same amount of stress on my engine as others do.
As far as power gain differences between a flex fuel tune and E85 tune, the only way to really compare is if you get the E85 tune first & get it dynoed... Then install a flex fuel kit on the same car, & tune/dyno it again on the same dyno under the same circumstances. Which I haven't seen anyone do yet... Seems like too much effort & money for too similar of an outcome.
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