hmmmmmmmm honestly the fantom xr covers more bases overall soundwise right out of the box, plus the expansion cards make for a huge sound source.
secondly, the motif does acoustic/organic sounds better then anything out there- rhodes, guitars, flutes, solo strings, solo horns, etc and has strong synths.
the roland does those things good-not great- and they get better with the cards. plus the sampler adn its resampling features. the motif es has more in the way of effects- literally 5 times more effects inserts then the fxr, but the fantom fx are arguable better and the resampling takes care of that issue in terms of patch creation. its synths/world/string/orchestral are far better imo...
all in all, the overall "better" choice is the fxr but the motif es is a VERY CLOSE second. ideally having both covers everything great imagineable IF you know what you are doing.
bear in mind that the motif es is $300 less.