https://tiffinmotorhomes.com/class-a
Go to that URL and you'll find all the coaches you're trying to compare. Pull up the specs for each and do the compare.
I just saw a great review of the 2019 45' OPP Allegro Bus in Motorhome Magazine (I'm about 3 issues behind in reading, so it wasn't the most recent one). Base MSRP was around $450K with the as-tested price just under $500K....options on these things can be very expensive. Motorhome does a pretty good job on reviews as they actually use the test vehicle for a while and they WILL report problems or usability issues they had, even little ones like one unit (not a Tiffin) where the toilet paper holder would fall off the wall constantly while going down the road...not the roll of paper, the holder itself! They didn't find much to complain about with this one!
Here's the review:
Motorhome Review: Tiffin's Allegro Bus 45 | MotorHome Magazine