Truck topper question , who has a Tall topper

[CRJR45]

I did a search but it seemed like every thread ended up bad so I’ll start another.
I have a cab height topper now and a platform on one side for a bed .
My question is do the taller models like Leer 122 or Century T Class actually have more usable space?
Pro vs Cons ?
I see one I’m interested in but wonder what the interior bed to ceiling height is and whether it’s worth swapping.
TIA