I've got the little Scotty electric. Plenty fast for the shrimps, but I haven't tried a gas puller before so don't have a basis for comparison. Only downside I can think of is the boom is a touch on the short side. Upside is it's very small and compact for storage, and fits my DR base for an easy deployment when needed. Not a long track record on these in terms of longevity since they just hit the market 1.5 yrs ago.

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"Laugh if you want to, it really is kinda funny, cuz the world is a car and you're the crash test dummy"
All Hail, The Devil Makes Three