ORIGINAL: forestroke
all things equal, i think heavier is more important than bigger. if you weighed down your pulse or escapade, it'll be much more stable in the air but of course will not be as easy to fly. in my experience the wing loading is the most important element. as charlie mentioned, the faster your specific model flies, the less it will be affected by the wind.
Exactly though even a loaded Pulse or Escapade is not great at cutting 20mph winds, as I've flown both in such winds.
My all time favorite "high wind" plane is the Great Planes Big Stick 60.
I've installed 3800mAh NiCd 6V packs in it just aft of the wing, and I'm flying with a SuperTigre .75 engine in it.
The only reason I MAY stop flying is that the winds are sooo high that the plane simply cannot stay on the ground at all... at this point the wind is high enough to be blowing stuff out of my tool box too!
The plane is wonderful in higher winds, and I can keep it aloft for 30 minutes or more due to the added lift of the winds.