I've witnessed many people, learning-to-fly on the HobbyZone Super Cub, so I will not bash the Cub as a decent trainer.
Some pilots actually prefer tail-draggers, for learning, and others have never flown a tail-dragger in their entire careers.

HobbyKing has another well-known trainer, that many people have had success with, called the BixlerPowered-glider.
The USA Warehouse stocks enough parts and kits to keep you going, but you may need to special order from the International Warehouse, if you break something.

Search the RCU and RCG forums for the pros and cons of learning-to-fly with 3 versus 4-channels.
Thoseissues have been discussed here, before, and at great lengths.
Also, nitro versus electric has been discussed, around-and-around in circles, and beaten into the ground....don't waste your time.
Get the beginner-plane that appeals most to you.

The only red flag, that I'd suggest you be aware of, is that some distributors, including Horizon Hobby and Hobbico, advertise their planes as "trainers", and that can be misleading.
A trueprimary trainer is not a good way to teach-yourself-to-fly. If you do decide to start with "full-house" 4-channel control ,and conventional landing gear, then a flight instructor is neccessary.</p>