You have to decide what you want. The DW and I wanted, a bed you could exit without crawling over your partner, a large enough pantry, a large bathroom with linen closet and enough floor space to accommodate the two of us and a large dog when things got nasty outside.
The TT also had to be about 5000 lbs. dry so the loaded tongue weight would come in at about 750 lbs. to keep within the Max cargo capacity of our F-150 when loaded with family and gear.
We settled on a 25 ft. TT with a slide. Slides do add another source of trouble but I would not be without one. However I also would not have a TT that was inaccessible if the slide is in. We make too many random stops for lunch or snacks etc.
As for brands, you pretty much get what you pay for, better materials and construction cost more. Higher quality models sometimes cost a lot more.
Twenty six foot 2010 Dutchmen Lite pulled with a 2011 EcoBoost F-150 4x4.
Just right for Grandpa, Grandma and the dog.
