Personally, I'd like to watch both (and will certainly watch whichever is not being shown on the monday back at the flat). However, judging on the film of Bebop and the two or three episodes of Star I've actually seen, I vote Bebop. If nothing else because the grappler arm thingies are a bit on the silly side.
However, I will admid my lack of know-wots in this area willingly, and am happy to watch either.
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The first rule of jungle warfare is, of course: eliminate the jungle.