I would say it depends on how big a role you want to see Martial Arts or vehicles play in whatever game you plan to run. If you're going to be doing a Fantasy game, I would advise the Martial Arts book, as it has more that will be useful for that genre, magic carpet/self propelled boat aside. If you're going to do something where vehicles will factor heavier than personal combat, for instance a run&gun sci-fi game, then having advice on ship creation will come in real handy. The problem you have, essentially, is that both books are applicable to whatever genre you're doing (as they were meant to be, of course), so I actually think you'll end up wanting both. That makes the discussion which do you get FIRST, and for that, my previous advice is a bit more appropriate...
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