I have both pacmans (3 actually) and a pyxie frog. I don't like to pick favorites because they are like children to me (semi-serious), but I think if I only had one frog of the two I would have the pacman. S/he is adult size and just generally really neat to look at. The pyxie is much more active at feeding, though. Adult pyxies are supposed to have a terrible bite, mine is a year and a half so I'll see when time goes on. My pacman can draw blood from a bite, though...
My pacman was always buried in the substrate when it was young, and the first 6 months or so you will be looking at dirt. Now he won't regularly cover himself completely although he has the oppourtunity to.
In short, I have both. (Are you looking to get one or the other, Reptile Kid?)