RE: 1/5 scale Cub, full or clipped wing?
If it's realism you want, go with the full wing. But if you want something fun, clip the wing.
Contrary to popular belief, the clipped wing doesn't make for a "Hotter" cub necessarily. With the CG right, a clipped wing cub will still float like a dream. The reason for the BIG wing on the original was that it was designed to fly on a tiny engine. It would be similar to putting a .30 engine on a Cub that is designed for a .46. They NEEDED that big wing to get off the ground.
The Only problem is that a wing that big creates a lot of adverse yaw. In a FS Cub that's not a problem since you coordinate your turns anyway. But on a model, it means you will either have to coordinate your turns, or get used to watching it slip sideways during a turn (Losing altitude as it does).
Personally, I like the way a clipped wing flies better than a full wing - Even on those days when I just want to putz around the sky. But if you don't mind having to swing that big wing through turns just for the sake of looks, have at it.
PS, there's always a compromise... You can clip half the amount they tell you to.