I would definitely take the big one! If you're anything like me, you need lots of storage room and a cup holder is a must! I always brought my Graco DuoGlider double stroller for my 4 and 6yo and both seats recline, the kids can get in and out of the seats easily and it's pretty easy to push.
Sadly, we gave it away about 6 months ago and I haven't forgiven myself. The only time I would ever use it is at a theme park. We went to
Disneyland at Christmas and rented a stroller there but they only had singles and the kids fought the whole time over who would get to sit in it. (It was just the 3 of us, so no other adult to push a second one.) And there was very little room for storage and I had to carry all the stuff from the car to the theme park entrance and renting the stroller was expensive and I had to carry all the stuff back to the car/hotel plus deal with 2 tired kids.
For this trip (in 5 days!!

) I am taking a smaller single stroller but it doesn't recline and is short so I have to bend over to push it (and I'm only 5'7" so not super tall). DD4 still takes naps, so I wish it would recline.
Oh well. Teaches me to freecycle my stroller!
JULIE