Everyone pretty much has 100% coverage. We've lost some snow pack and gained some. Generally speaking, the snowpack in Colorado reaches 100% of it's maximum depth around May 1st. Then the melt off starts in earnest.
So conditions wise. Breck has gotten the most snow this season of any of the three you mentioned. If you are riding on 100" deep snow or 80" deep snow, is that going to really make a difference in your experience? I doubt it, everything is still well covered.
A-Basin is the highest area, so if there was a storm coming in followed by a blue bird day the powder would hold longer there. Conversely, for warm spring conditions, A-Basin will take longer to thaw into that wonderful spring corn.
Again, they are all good, and right now it really isn't going to make a difference. So if you have one resort you prefer over the others, I'd just go to that one. It'll be fine. In fact, Breck and Winterpark will both be fine until the end of their seasons which is in a couple of weeks. If they stayed open for another month, then you'd probably have things to consider, but not right now.