C150 or C172
I started flying on a 150. Then when that went off for the CofA moved onto the 172. Found it a much more stable aircraft and easier to trim etc. as previously mentioned. I went solo on the 172.
Then when the 150 came back I found it hard to readjust. Took me a couple of flights with the instructor to get into the groove for solo ccts.
Since then I've trained at another organisation and have soloed in PA28s. Personally I find the airborne characteristics of the C172 closer to the PA28 than the other Cessna. Prob due to similar weight and power.
I must say though, that in my limited flying experience ( <60hrs ) I still love the C172. Flew one on a ferry flight recently and it was like revisiting an old friend.
Carlito