The PSP-shaped ones, I think I'd prefer since the cramped handhold and tiny buttons of the Vita has been a drawback for me.
Still an interesting development. I would love to see a legit product in the Android market from a notable manufacturer (I have the Xperia Play and like it OK as a game machine, but it should have been the start of something rather than the proof case to not start anything) as these Chinese knockoff devices are tough to buy. Sometimes they're pretty awesome though, I've bought a few devices that have been worth the money. I'm interested in impressions if anybody picks one up, but I don't know if I'll be a risk taker in this case.
Weird that these Chinese knock-off devices always rush to get the latest version of Android possible onto their machines. It's cool that they do but it's not 100% necessary yet, these specs they're targeting probably aren't great for Android 4.0 but you could do a lot with them in lesser versions and could more easily hack the shit out of them too. (I don't think there's any future-proof drawbacks either in adding apps, I don't see a lot of apps that limit by OS version but maybe I'm reading specs wrong?)