Well the G-rider and the G-Play are two different toys, and it seems like they got mixed up in this poll.
The new Revo is interesting, but I'd go with the Rider with how comfortable the base is and because it's larger. I'll be reviewing the Rider soon, but I got a feeling that you won't be able to easily rock on your chair with this new Revo.
The Revo is probably the most powerful, as it is powered by two AA batteries (vs 1 AAA for the Rider), and if you intend to use it on a bed, it should be worth considering.