Why they have both had the nasty designed out of them.
The C152 mushes and the PA28 does something which isn't really a stall as such because you will never get the AOA across the whole wing past the critcal angle.
Both of them in a training sense will never really teach you what a true stall is.
Both are pretty boring aircraft to be honest designed for the mass market and to mostly stop idiots from killing themselves.