Ufriendly,
I haven't played either boards, but read the synth forum at Harmony Central and those guys would say that; if you like electronic music then it's the Triton, for POP music with good acoustics then Motif. Orchestral patches Fantom. Pianos - Motif/S90, Triton pianos don't cut it. Like most people wud tell you, try them out yourself. It depends on what type of patches you prefer. The type of music you like.
Kevin