Vastly prefer the C150 or C152:
* No rudder/aileron interconnect.
* L & R doors
* High wing. I use it to show AoA changes using the lower surface vs. the horizon).
* High wing. Can enter & exit without getting soaked. And without the seat getting wet! Or stand in the shade.
* Cabin is shaded by roof & wings
* Reasonable air vents that can be directed on face or body.
* Opening windows.
* Prefer the aerodynamic trim tab vs the PA38's spring.
* I *like* throttle & vernier mixture knobs in singles.
* aerobatic version available. Standard version spinable.
* Easier to demonstrate certain aerodynamic effects eg adverse yaw, effects of flaps.
I think I can develop a better pilot in a C150/152/172 than in a PA38 or PA28.