Are you going to use this stroller for your 4 year old only? Are there any plans for more children? Sorry to be so nosy but I would definitely think about investment if you plan on using it on a second child.
I bought the Triumph a couple of months ago for my 2 1/2 year old and I do love it. I knew NOTHING of these strollers before this board

but I am very glad I bought it, BUT...............................
If I had a 4 year old and was not planning on having more children I would definitely not invest $100+ on the Maclaren. I would
rent a stroller at Disney because hauling the Triumph around along with everything else can get to be a pain. If you rent then you have a stroller only when you WANT a stroller and not all the time. The strollers are so light weight (which is awesome) that you can't hang anything off the back so if we return to Disney with a 4 year old in a couple of years we might rent a stroller for all day park days because you can put so much in the double renter and I dont' have to haul it from home!
I am certain I have confused you more but I wanted to give you a different perspective. Don't sweat this decision. If you buy the stroller you won't regret it because it's great but I wouldn't buy it just for this trip or just for one child at this late age. I need a greater return for my investment