I have both. The Quest with a YS140 and the Excelleron with a Saito 100.

You can't go wrong with either, both fly really nice and smooth. The Excelleron is a lot lighter (obviously with the Saito) and flies really slow with unlimited vertical (but it is not a rocket going up); I had some difficulty balancing because the Saito is really light, with the 120 you will be right on the spot with more vertical and speed.
The Quest is a monster with the YS and I have to fly it a less than half throttle most of the time and maybe at half throttle going up. I had to install the tail servos in the tail and add an ounce of lead to get it to balance right, but it is a great flying machine.
Both fly different but very good, maybe the Excelleron will have a slight advantage because of the extremely light wing loading, but then I have the 'old' Quest, maybe the new one with the modifications they made to it flies even better and lighter.

I don't fly 3D, but I believe these are also capable of that.

Gabriel