Good choice with going with the Cub over the Edge for right now.
Hate for you to get frustrated after you build the Edge and end up crashing. With planes, if you are new, it's always best to start with a Cub style plane.
If you don't wanna fly the Edge as 3D then you don't have to. I know a guy who has an FT3D and he mainly just does more sport flying with it. If you grow from the 3 channel Cub, you could easily convert it 4 channel. Don't want dihedral in your wing? Then don't do that step. One of the great thing about FT planes is they are so easy to modify or set up for the style of flying that you prefer.