Personal choice for many reasons including those already mentioned and some that were not.
IMO, people buy a floorplan that works and a weight their truck can handle and a length they can park .
I suggest researching the differences of both and researching the differences of wood vs alum framework.
You can have anyone with basic skills and basic tools repair aluminum skin. It gets more involved with Filon and usually takes more time, therefore you need to have a barn or large garage and that can lead you to an RV repair facility ($$$$$).
In the past, there have issues with alum framed units with screws that become loose over time in alum tubes that do not have wood inserts for the screws to bite into. It seems that units that are built so screws have some bite, seem to hold up better. Some mfg.'s corrected it.