The solo does handle winds better then the Phantom. Ive seen this first hand. The Solo weighs significantly more and now with a gimbal and the heavier GoPro4 black Im actually amazed at its weight. This isnt a light UAV...One reason I believe motor pod improvements are planned will be to hold against stronger winds while carrying future accessories AND the gimbal. But weight can increase stability in wind. Solo selling itself against larger film worthy UAV's absolutely needs to handle small winds.
One important thing Ive been told is that pivoting in high winds will crash a phantom and it makes sense that the computation keeping each rotor spinning to resist winds gets complicated when any UAV is rotating.
The least amount of winds are usually found here where I live in New Mexico during the "magic hour" anyways...so I usually find myself waiting till evenings to fly. Its cool, the lighting is ideal and winds are generally calm.
Lasty I did notice a bit more jitter in winds after the last major update in connection with the gimbal. I noticed this before adding my gimbal but it appeared to wobble. Im not too sure though.