I got the Quest for my son to use at WDW about 1.5 yrs ago. I wish I had gotten it first vs all the other ones I bought! I cant recall anything about the Triumph, but I read lots of reviews on these boards before making my decision. As with all Macs, theyre good to 55 lbs, something I needed since my son can still use it at 4 and 5 yrs. I knew we were going to have another baby, so I wants something that would recline. The Quest doesnt recline flat so our daughter couldnt use it until about 3 months. It wasnt a problem since she loved being slinged. The seat extenders are nice to have (sort of like a leg rest for little legs). The storage basket is almost worthless for me. Its hard to access when the child is seated, and its pretty small. At Disney, I toss in our jackets, some diapers and wipes and have no problem leaving the stuff in there when we park the stroller. I did get the Mac organizer which hangs from the handles and works well. Hope this helps!
alison