Purely preference, you've got to ride them all to be sure. I'd check out switchbacklongboards.com they have every brand you'd ever want.
Id say Abec 11/Pink/Retro (all the same guy who makes them) and Orangotangs are the definite favorites.
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There is not so much the best or fastest brand of wheels it depends on the bearing you have. and a good place to find wheels and bearings are at surf one.com
To my belief and perspective, spitfire is the most sick, wiked, and most pop wheel for the skateboard.