Comfort is a relative term. The Mega Cab will have the most overall room (knee/leg room as well as room behind the seat, but that does not necessarily make the ride the most comfortable. Most any crew cab truck is going to have sufficient room, it is up to you to decide which truck has be best overall seat and overall riding experience. I would suggest riding in all of them and then make your decision. I had an older Mega Cab. Loved the truck and the room, but the rear seat was not that comfortable, especially on long trips.
