Epoxy where needed, CA everywhere else.

Any joint is best and strongest with zero gap, which ever glue you use, and it is easy to get zero gap with thin CA - put the two parts to gether, then add CA.

I hardly ever use thick CA any more, I use thin where two parts can be held together as it is applied, medium for every thing else. I only use thick where I need to do a large area, so don't want it to go off.

I want my planes to be rigid, not flexible, so the idea of ali glue being better because of this makes no sense to me. The only planes I have seen come apart have done so either because the ground got in the way, or because they were badly built, both of which is not glue type dependant but modeller ability dependant.

Ultimately, use which ever glue you are happy with. For me that is primarily CA.