I had the prime, and traded it for the infinity through warranty claim. Both are very good, the resolution of the prime is 720p, while the infinity is 1080p. The processor in the infinity is better, but it actually lags a little bit more because it has to push so many more pixels than the prime. Also, battery life was much better on the prime because of that as well. Prime lasted about 10-12 hours without keyboard, infinity about 8. Both are currently running 4.1.1, no word on 4.2 for any device that I know of. Some more things to consider before you buy.
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Current Devices: Nexus 5, Asus TF700, Google Glass, (2013) LTE Nexus 7, Logitech Revue, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Nexus 4