RE: 3D planes
These planes, because of their super light construction, actually land slower than trainers, but because of their low mass, need a fairly steep glide slope to keep that speed up. Also, the large diameter low pitch props used on these planes act like brakes when the engine is idling, you may have to have the throttle open a little to make a nice landing. These light airframes are not designed for high speed flight and putting a normal prop on the engine and flying with the throttle wide open is just asking for wing flutter. Those 12x3 or similar props not only give the thrust need for hovering manuvers but also effectivly limit the top speed of those planes to something that is safe for the airframe.
If you are looking at one of these for your second plane, reduce the elevator and aileron throws to about half for your first few flights and make sure the center of gravity is a little on the nose heavy side of the CG range. As your skills improve, you can increase the control throws and move the CG back.