OutlawDrifter
Long Roof K2500 Driver
Personally, I have both on my two Yukons, and I think if I was ever going to buy another GMT400 SUV, it would need to have the liftgate/tailgate. Tailgate gives you more supported space, and you can open just the liftgate and have things sticking out the back. Barn doors are more complicated to leave open and secured, in my opinion.
Barn Doors 1000%.
Much easier to reach into the back when you don't have to first reach across the tailgate. If it's too big to fit inside, put it on a trailer. Leaving the glass up or the tailgate down is just begging for trouble.