ok, my $.02 worth.
I found pipers to be more stable, more forgiving on the stall and great visibility. No spins allowed (except the 140) and had stiff legs, good steering on the ground and better controls and better ergonomics. Fueling and preflight were super easy. It was always REALLY hot inside and really poor ventilation and the only right side door is just plane asinine. Never really cared for the stabilator (bushings were commonly a problem leading to a possible flutter). Slips really were not that interesting and almost pointless.
Now Cessnas were a tad less stable, (which I liked), most earlier could legally spin (although difficult to maintain) with ok visibility and springy legs to help first time landers. Slips to landing were well defined as were cross controlled stalls. Preflights required a top of wing check and snow removal was also a pain. Ventilation was moderate to poor in the old models and ok in the R and later, but you could always open the windows easily (and sometimes doors). It was also cooler due to the overhead wing acting as an awning. Steering on the ground was almost like having a free wheeling nose gear, especially if the owner let the springs get old, which was common.
By performance in a learning environment (actual flying skill) I would suggest a Cessna 172. The earlier model, the better.
The hotter the climate, the more I'd suggest the C-172.
I thoroughly enjoyed the Pa-28 series including the -140 -151 -161 -180 -181 -200R and also flew the Cherokee 6 at length commercially. I also know that a single door means death in an accident if the pax in the right seat is unconscious, old, fat, or too stupid to open the door (or a combination, and I've flown with ALL of them).
Sorry about the wall O text.
CE