We have a Peg Aria. We got it in '05 when we adopted our middle son (then 2 yo). We took it to WDW and everywhere else. We have almost run it into the ground.
What I love - fairly lightweight (I think 10-12 pounds?), the basket - easy to access & large, reclines fully, folds easily, the snack tray, and I can put a bag on the handles and it won't tip when the child get out.
What I really dislike - it doesn't turn well, esp. with more weight in it. I mean it's really very hard to steer at times - which can be a huge pain in the parks. You also have to steer with two hands.
We also have a Mac Techno XL. We only recently got it for our trip this fall as our middle son (now 5 yo)will need a stroller in the parks.
What I love- It turns on a dime, I can steer it with one hand, it folds compactly for such a big stroller, it holds up to 65 pounds, and both little ones can climb in and out by themselves (no snack tray).
What I dislike - Access to the basket - ugh, it is such a pain (it's a good place to put those rain ponchos, etc. that you don't need all the time). This specific Mac is also kinda heavy at 17 pounds, but I know the Volo and other Macs are very light. Also you can't leave any heavy bags on the handles or the stroller tips when the child get out.
We'll be taking both strollers when we go in October. Both are good in different situations.
Can you go to a Babies R Us and test drive both of them? That might help you decide. I guess it depends if you want something really easy to drive (Macs) or the features of a full-size stroller (Pegs). Sorry I may have been more confusing than helpful.