Yeah, my WSM never was affected by cold, wind or zombie attack.
I have a Rec Tec, and I love it. I have not had to deal with any cooks in high winds over 15, so I can't comment, but I will say the Rec Tec is a solid rig, and well worth the money.
I've cooked ribs, butts, chicken, brisket and a 40 lb whole pig, and each cook was perfect. The Rec Tec temp was always within a few degrees of the set point.
If there is a high wind, this can affect the probe, it will sense a cooling, and add more pellets to the pot. So you may see a temp spike, but the spike never last long, and will not affect cook times.
Your purchase all comes down to your needs, and what you like in a smoker.
Good luck