Which would be better for smaller ears and provide a more comfortable fit?
Which would be better for hip-hop and trance type music?
How well do each of them isolate?
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If your ears are really small, maybe ER6i's or Jays would be more suitable, physically ...
... but sonically, I'd say the Future Sonics will fit your listening tastes, generating the kind of deep sound that few IEMs can match while not overwhelming the mids and highs. Last night I was listing to a tiny Creative Zen Stone through the M5s, and once again the Atrios shone -- whether with the Stone, a Sandisk Sansa Clip, a 2nd gen. iPod Nano, a portable CD player, or other DAPs I've tried them with, the Atrios are really nice (they do very well with players that are un-EQ'd, which includes iPods, which don't EQ well, and they don't have to be amped to sound excellent). The player was set on random play, and the variety of music ranged from Roxy Music to Ulrich Schnauss to Portishead and more, and the low end was very present -- and clean (no "mud"). They do acoustic, guitar rock, blues, soul, Motown, country and soundtracks, well, too, for the record...
I like the look of the Westones, and the cords are supposed to be a real selling point, and many posters on Head-Fi say they're the most comfortable IEMs. But note that I was using the same Comply foamies on the M5s last night that come with the Westones, and they were quite comfortable (I wear the M5s "down," and they look like a miniaturized Bluetooth phone that way ... they're very light, by the way). The expensive UM2s would be a more direct competitor of the M5s/M8s, in terms of performance ... which is why I got the M5s for basically half of what the UM2's list price is.
