One of my planes that I referred to earlier that was snappy was a Sukhoi. Again, I don't want to mention any brands because my purpose is not to bad mouth any manufacturer but rather to bring light to the fact there are some brands that are better than others when it comes to snappiness. (actually I should say "they don't" snap instead of they are "better") The Sukhoi was helped tremendously by rigging the ailerons with the trailing edge about 1/8" to 3/16" up when they were neutral. It was still snappy but not nearly as bad. The first 50cc plane I bought that had NO snappiness was a Comp-ARF Extra 330 that was used which I got at a swap-meet for a 100 bucks. It was more of an IMAC plane but it would do some 3D stuff fairly well. Shortly thereafter I had the opportunity to fly my nephew's AeroWorks Extra 260 50cc and was so impressed that I sold the Comp-ARF and got the AeroWorks. I've never regretted that move.

One last note - I also have an EFlite Extra that has NO snappiness and it's tiny compared to the AeroWorks Extras so size isn't it. It also has tapered wings so that ain't it either. The CG on it is so far back the plane climbs pretty bad when rolled inverted from level flight. I haven't done the math but the CG on it is probably behind the neutral point and that thing is a blast to fly.