I think, if you are into modern 'groove' or 'smooth' jazz, the Korg will be your better bet. If the quality of the piano main voice is a high priority, perhaps the Roland.

If you do a lot of editing to get a style just the way you like it, probably the Roland. If you want to dabble with a sampler, or creating utterly unique synth sounds (rather than just using the many great synth presets in a Roland), probably the Korg.

If smoothness of style variation transitions is important, probably the Roland (six fills and a break/mute, as opposed to two fills and a break/fill). If multipads are important, probably the Korg.

If MP3 playback is essential, then the Korg (or an E80).

Decisions, decisions...!