It's not feature complete, but Data Studio felt like a breath of fresh air compared to SSMS being all the slowness of Visual Studio coupled with about 1500 places where configuration might be.

(Of course, what do I know. I use DataGrip for my databasing these days. It's fine.)

My experience is that SSMS is slow to open. ADS is fast to open but otherwise slower and unreliable.

I still mostly use ADS for the git integration, file comparison, terminal, and file picker though.

SSMS only for those admin tasks where it has a nice GUI, or when ADS breaks in some way (happens a lot).