Personally, I think the only arranger instruments available today with an actual "live" sounding drum kit and/or drum tracks, would be Ketron's Audya and, to a more limited extent, Yamaha's PSR-S950.

All the rest sound much alike, and all are very good with the difference being mainly subtle, but none sound particularly "live" compared to the two mentioned above.

Regarding what Gary said above, about the bass often being the "driving instrument", I would have to say Yamaha's mega-voice basses are the most expressive and realistic to my ears, but again, differences between other brands are subtle, and, of course, sound preference is highly subjective and personal.

Ian