That is exactly why I think Snare is great right now: Miracles and Grixis Control.
But it is indeed a hit or miss, no doubt about it.

There is enough bad match ups for both Pierce and Snare, so it is mostly just a preference. They hit some of the same cards but I like to have the one that answers snapcaster and strix in my main and the other on the side. Again, just a personal prefence based on roughly 10 years of DreadStill :D (could be more actually?)