Just go and have a great time. You never know what you're gonna get with conditions when you take a flight somewhere.
I was in Jackson Hole mid-Feb and it was a great time but the conditions were only so-so, a few inches here or there. But while I love the mountain, it was relatively icey and the conditions reminded me of East Coast snow (somewhat).
I was in Whistler a week or two ago and we got 40 inches of snow mid-mountain and higher in a few days, but it was also raining on the lower mountain/village. I just got lucky with Whistler but not Jackson.
Either way, I loved both, and the amount of varied terrain at Whistler that people mention was awesome. Just go and have fun, you will enjoy it either way. Don't start trip off on a bad/sour note.