Unless I'm mistaken, you can "snap" a car seat into the Techno, which can't be done with the Quest.
The Techno can be used with a newborn since it reclines further. The handles on the Techno can adjust up and down also.
I bought a Quest because I got an unbelievable deal on it ($90), but I would have rather had the Techno since it can be used with a newborn. The Quest we have recommends waiting until the baby is 3 months old since it doesn't recline as far.
The Maclaren website actually has a nice comparison chart for the various strollers.