I just went through the same exercise comparing the ACE 30.1 to the FR3 and chose the FR3. The Ace had lots of conveniences I really liked. The flip out passenger seat dash tray with 12volt and AC outlets in the tray compartment. Really well thought out. I liked the 32" TV adjustable bracket arm to turn the TV toward the front seats so you could easily watch TV while eating or having cocktails on the removable table that is mounted between the front seats. Very nice and well thought out. However, my wife and I thought the dinette and coach seating was cheesy and not comfortable and would not be comfortable sleeping on either. The ACE drove very nice but had very limited external storage capacity.
We both thought the FR3 was better quality and loved the sofa hide a bed with built in foot rests. The hide a bed was a full queen just like in the bedroom. I found in most coaches the queen bedroom mattress was the shorter 60" X 75" mattress. I am not that tall at 6"1" but would hate my feet hanging over the end of the bed. I also liked the leather seating and the driver and passenger seats were very comfortable. The external storage capacity was almost double that of the ACE. The ACE had only 68 cu ft verses FR3 112 cu ft a big difference especially for extended trips for a month or more. Even 112 cu ft may be challenging for long extended trips. The storage is an issue to really think about.
Hope this helps,