I echo Genghis' sentiments, only to add that you'll find flying a PA28 easier than a C172.
It requires much less rudder input both to counteract adverse yaw and to balance an established turn. It also really flatters your landing technique: the thing virtually lands itself. Stalls are also an incredibly boring affair in a PA28 - the aircraft never seems to properly stall: it just mushes downwards wobbling in and out of the stall at about 1,000fpm. Really quite dull
No wonder it's such a popular trainer.
Cheers
foggy.