both these keyboard are pretty non professional. if you don t need a better but more expensive keyboard, the way to go is roland i believe. the same series of roland, with 76 keys and some extra sounds (exr7) is rated pretty good.
exr has better sounds, better key feel (though not very good!) better builded, and better design i believe!
...but your ear and your pocket should make the difference!
Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.