Focus on the 152 because it is twitchy, compared to the other choices, it'll make you a better pilot. But, spend so time in a Piper or other types too if you can find them.
Your managing the differences will also make you a better pilot. You will know that you are a competent pilot when you can cross types with a read of the Flight Manual, and a brief check flight.
Though they do have system differences, and their own quirks, they are all adequately similar to each other. if you're competent in one, you should be at least safe in any other.