how much of a differnece is a yamaha mo6 to a fantom x

serious debateing on wether to buy a new board but not to sure if i even should cause ii already have a korg m50 and dont really need more brass,piano,or woodwind sounds just mosty into synths.But i have been on a motif and the sounds are awsome including the synths but i dont really wanna wast my money on just a different boards synths when software are mostly all about synths.