I think Cache Mid is a fucking nightmare if you're not doubling up. Solo holding you get about 20 seconds of stall time with your smoke and then you have to watch mid and boost.. A is alright if you're soloing. Most times I smoke main, if they open with a truck smoke you can molly off the path to quad and dance around their for a bit.

CBBL drop for sure.

Overpass, i don't think is too challenging at my level b/c nobody knows any smokes to take a site but if I had to pick I'd agree that trying to maintain control of bathrooms is pretty difficult.

Train, same issue with overpass in that smoke/nade usage is non-existant in my level. Can't give a certain answer.

Mirage - A site just b/c of the amount of people that take the time to learn smokes for an execute. Usually you have CT, Jungle, Stairs smoked and if your in site you're taking a 1vX situation b/c your team mates are blocked off.

Nuke - Outside b/c of the addition of the easy boost to silo and rafter now wrapping around the map completely.

Inferno - agreed.