If you're bars spin the same way that your tailwhips do (full whip), you should spin fs. I think trucks where your bars and body spin the same way look retarded. I think bs spins look a lot better, although a fs spin that doesn't look forced looks good. and finally, I think bs spins are 100000000X easier. you can spot your landing on a big 360, which really helps. its hard to do a fs half cab goin fast