Help deciding and alumn vs wood frame question

I've had both tin and glass. Don't really notice much difference between them. We are most interested in floor plan and weight, so when we find the floor plan we want at a weight that our TV can tow, doen't matter what construction or siding it has. As for roofs, I prefer the really old aluminum roof where you can see the seams and can then keep them sealed. I like the sound of rain on the roof.