I have the 2010 King Ranch Super Crew.
Love it!
My only warning is if you want SIX seats, the middle front seat is not adjustable, IE that person sits fairly far forward.
I am 6'5, and when I set the front seat to my liking, I can climb in the back and have about four to six inches between my knees and the seat back in front of me. Lots of room. With my kids in the back, my wife or myself can get in and stand inside to buckle them in, or just to sit in the middle seat if we have someone else with us.
Great truck. I did a 2200 mile trip (ONE WAY) in January, and I felt uncomfortable for a total of about half an hour, simple seat adjust and I was fine again for the rest of the trip.
One thing is that those trucks will not fit in some garages. You may allow that to influence your overall length choice. Mine has the 5'5" bed, and I make it into my garage with about six inches to spare (three in the front three in the rear).
The Dodge, on the other hand, were no more roomy in the Mega Cabs, and far cry smaller in the bigger quad cabs. Good luck in your choice.