The 27FLDS has a 16' awning on it. We have a seasonal site on a lake lot so we liked having the living room in the front of the trailer so that we can look out at the lake which the 27FLDS allows us to do. Also, the trailer we bought had a table with 4 chairs instead of a booth. We were also concerned about the slideout on the awning side taking up space of our concrete patio at the lake. Finally, the trailer you are looking at weighs more which was going to be a challenge for us with our truck.
I will tell you that the 31RLDS has a much better kitchen layout than what we have. We actually have no counter space which will be interesting. I still think that large living room would be great with the 2 sofa's and that entertainment center across the back wall.