The difference in flight quality between a almost-full-size unflapped plane like the Sig Skyray and a 1/2A-sized plane is huge compared to the difference in flight quality between a Sig Skyray and a same-sized flapped plane.
If your goal is to fly a better plane, and if you have the room or are not otherwise stuck with 1/2A planes, I'd suggest a bigger plane. Even a "15-sized" plane like an Akromaster should fly better.