OK...Realizing a big difference in the arrangments, playing abilities etc....Close your eyes...listen carefully and see which one you think sounds more like a full orchestra. Try to listen to the sound, not the playing.
Lowry:
http://www.youtube.com/watch?v=r9GSSApv568Yamaha:
http://www.youtube.com/watch?v=DshfffItK0k&feature=relatedRoland:
http://www.youtube.com/watch?v=-wnDAPcoPsk&feature=relatedAnd T4:
http://www.youtube.com/watch?v=AZXlxuSWieI&feature=player_embeddedYou could probably buy 10 T4's (or more in a couple cases) for the cost of one of those monsters...even though I like them.