Hellephant,
If you are going with dual aileron servos and strip ailerons, you can do either plain ailerons or flaperons. There is no difference in how you build the wing for either/or. You will end up using the same surfaces for either. The only difference is how you connect the servos to the receiver. With ailerons only, you can connect both aileron servos to a Y harness and straight to the aileron channel of your receiver. With flaperons, you have to connect each aileron servo to a separate channel and mix them as flaperons with the transmitter, which has to have the flaperon function built in, i.e: you will need a computer radio for flaperons.

Jesse