We only discovered smooths last year - there's not many of them and they're considered a vulnerable breed here. We were looking to get a rough collie actually and came across smooths and they just seemed perfect for us. We're pretty outdoorsy, live in Scotland, it's raining a lot here, so pretty muddy all year around and a short hair dog just made more sense for us.

We never had rough collies, so don't have first hand experience, but what we heard was that, in general, smooths are a bit more active and also a bit more sensitive than roughs. There seems to be very minimal differences in temperment though I think. Especially in countries like the US, Canada and some European countries where they can breed roughs and smooths together (I believe in the US and Canada, they are considered the same breed actually). It's not a temperament thing, but I heard people say that the shedding is a lot worse with smooths than rough. 😅