IIRC you are in the US and have a V2 hub, correct? And you want a standard rocker style switch, where you press on the top for on and on the bottom for off.
If so, a very popular choice are the Zooz zwave switches. Good price, excellent engineering, ETL safety certifications, work well with SmartThings and the Company has historically been committed to dealing with SmartThings’ various idiosyncrasies. For example, they provide their own custom edge drivers. They also have very good tech support.
Zooz is the house brand of the specialty retailer The Smartest House.
You can buy these at Amazon or direct from the smartest house:
https://www.thesmartesthouse.com/collections/zooz
Yes, they’re zwave, not Matter. I personally don’t think that’s an issue, but choice is good. 
(and of course, as I’ve mentioned before I buy all my SmartHome stuff with the idea that I might want to replace it every three years, so as long as I get my money’s worth out of it is that time I’m happy and I don’t have to obsess over futureproofing.)