RE: piper cub or decathlon
If you like to "Fly Easily" get the cub (I recommend a clipped wing, they still float beautifully and IMHO fly much better)
A Decathlon has a very short tail moment which lends itself quite nicely to aerobatics, but can also lead to the plane snapping when you least expect it.
I also like them both, but if you're looking to just putt around the sky, and aerobatics are a second concern, the Cub would be my first choice.