Just my .02 cents. We LOVE our super slide with the couch and dinette in the slide. Our floorplan is excellent and works just perfectly without the slide extended for those quick overnights or rest stop lunches as EVERYTHING is accessible (except the TV which we never use anyway!)
We travel with our sister/brother in law with no slides. The difference is most profound on those rainy days when being outside isn't an option - so preparing dinner while people are hanging out inside and then feeding them and having plenty of room to do it means we NEVER use the non-slide trailer when there are 4 or more people. And we can add chairs for larger groups. PLUS we traveled with a 75lb lab mix and we needed all that floorspace to walk past or around her - and we put her big bed from home on the floor in the LR which wouldn't fit in the aisle on a no slide.
There are equal camps to the slide/no slide preference. I will tell you brother-in-law was always "absolutely no slides ever" for many, many years. Having spent over 8 years camping over a month at a time with us (including dry camping - we have solar) has converted him.
I just go with the floorplan that feels the most comfortable and efficient, then go after all the other details. Resale shouldn't be a consideration with any RV but I would bet if you take care of either kind you will have no problem selling.
So my vote....YES get the slide(s)!!
