We chose the 29bhs G2 (pretty much the current 28bhs model) over the 26' mainly because DH and I want counter space for dirty dishes, walkie talkie charging/storage, DH's work space (he makes the perfect chef!). Although we mainly travel with the tt, we have grandkids so needed a bunkhouse. Because of this, we knew we needed extra space that the slide provided.
The current 28 model will provide more counter space over the 26 and have more 'people space' if you have more than two people. Pretty much what it boils down to for us. Hope this help
(fyi---we grew another "grandkid" since we purchased our current tt... we are now looking at a quad bunk set-up)