There are so many variables when considering your question I doubt there is a consensus answer. Some wood wings are very basic, some very complex. Some metal wings have been built from plans and others you wouldn't want to tackle without a kit. Every airplane is a compromise...what you might gain in low cost with one method might be offset with more labor than a different method.
I've built several aircraft (wood, steel, fabric, plans, kits) but don't think I can answer your question. It's sorta like asking what is the difference in flying a fixed wing or a helicopter? Both require different technique but either can be mastered by the motivated flyer.![]()