I've only tried three PSP versions; the PSP 3, PSP GO, and PSP Vista. Of the three I really enjoyed the PSP for a few reasons; the first being that it was small in comparison to the other two aforementioned versions. Secondly, the PSP 3 is inferior to the PSP Go is something to be expected as it is an earlier version, but the PSP Vista failed in my opinion because they just started adding a bunch of stuff and removing something as core as the method of reading games. So the PSP Go takes the cake for being slim, slick, and satisfying to play on aesthetically.