Both look good (to me), but I noticed some speed/smoothness differences between them (how fast they respond). The interesting thing was, however, that a lot of texts on the web claimed the difference to be the other way around
go figure.. It's not hardware-related, that I know, but something else. Both were usable, anyway..
There are probably others than those two if you're instersted, but last time I checked, those seemed the most mature.