Having had BOTH SET UPS, here is my take. I had a 36 ft triple slide 2011 Keystone Outback Sydney with the front bedroom being a BUNK HOUSE that had 2 bunks on front cap wall and hide a bed sofa and entertainment center. (3 years).
The LR area had NO Dinette, but a lounge w removable tables as shown in your model floorplan.
We enjoyed the leg room with this set up. We had a storage, heavy vinyl, cube as a foot rest.
We found kids liked snacking and lunch either in the bunkhouse or outdoors. Worked well for us.
We switched to the 2015 Silverback 33rl for rear living for more extended stays. We do four season use as we live in Atlanta and with exception of this winter, spend 90 days in Florida.
Depending on USE WITH KIDS, a serious consideration is how they can sleep in COLD weather against the walls within the bunk areas. They DO GET COLD.
IN SUMMARY: we liked our NON FIXED DINETTE .