Welcome to the forum.
I would be more concerned about any used trailer regardless of brands or floorplans.
Your familiar with rv appliances so you know how they should work.
Also running gear and frames need to be looked at. First trip on the road isn't a places you want to have issues with them.
FR or GD...I would choose the floor plan I liked and if it fit my budget...or my tow vehicle weight specs. A 5th wheel trailer that size can have well in excess of 3000 lb hitch weights... plus the hitch...plus other stuff the truck will be carrying.
