Both ways can work.
I am afraid I dislike edicts to do it one way. A bit like Burt Rutan, at model scales it is good for me to experiment rather than follow the crowd, just like Kraut and Tattoo did. You will learn a lot more and become an innovator, but that is a more difficult path...
Anyway, look at the Armin wing construction. Especially on a wing with taper, you will get a lot of torsional strength on a span-wise wing and little need for a structural spar. The ailerons can be cut flutes on the bottom surface.
And who said a crease on the top surface was a problem?