For me, it's Bind. If your smokes don't smoke, you're pretty much done for.
However, this map can also be extremely punishing for defenders if the attackers are rush-heavy. You'll be forced off the site into a retake, and I'd argue Bind retakes can be fairly difficult depending on your teammates.
Lastly, there's just so many goddamn corners. Corners everywhere. Before I've made it onto site, I've already checked 10 corners. Because of the corners, Bind promotes very slow, camp-like gameplay which can be harder on open(er) maps like Ascent and Haven.