G.B.
As your kids age they will demand more room, leg room, elbow room, etc....go for the larger/wider vehicle. If you think about it a van seems to be the perfect vehicle for you, that 3rd row is very necessary for growing kids. If you get the longer one where the back glass is NOT against the back of the rear seat.
I wanted a larger SUV but hubby said no due to the gas mileage. I am glad now. I love my van because the kids can sit far apart and be comfortable. They are 7 and 10.