We have an Encore, get a lot of use out of it. It's getting a little tight now for both our kids (5 and almost 2), close to time to move Thing 1 to a trail-a-bike when he's not pedaling (very slowly) beside us on his own ride. Basically, all other things being equal, anything to make the trailer larger inside would be better, so I might wish we had a d'lite instead of an encore (if the spec sheet is to be believed about 5 extra inches of interior width). Our local burley dealer guy generally only has one trailer in stock at a time though, and he kind of alternates between the d'lite and the encore, so encore it was.

Going back to the spec sheet, the Cub is supposed to have 16" wheels, and I have to say I love the 20" wheels on the Encore, I'd be leery of going back in that department. The Encore is a better stroller than the purpose-built jog stroller we have, attribute at least part of that to the wheels.