There are personal variables to consider: Can your TV handle the extra weight, how many will be in it, will a larger floorplan without the extra weight (slide) work better for you, etc...
My first REAL TT was a 26' KZ Sportsmen without slides. At the time it was DW & I with one small DD. Worked fine for us and my 4.6L F-150 had no problem with it. Over the years the family grew and it became too small. Since then I upgraded the TT and we have had two more, larger, heavier units with slides. I have had no problems with a slide and, even now that we are empty nesters, I doubt I will have another one without at least one slide.
I went back to a KZ FW and really like the KZ brand. The first one we had for eight trouble free years and I hope to get at least the same with this one.