And it isn't to say that both are good biz models.

  Expensive (high margin) fast hardware that can do more things
  Cheap (low margin) slow hardware that can do some things

The one thing we do know is that WebKit is winning. Now the big question is which JavaScript engine did they use? My gut says V8 due to the optimizations I know they could do with the cloud setup they have.

(disclaimer work for the webkit team at rim and this is all my own personal opinion)