Recommended wall switch (most of the posts I see are getting old)

There’s no one best as different people are looking for different things. For some people, even the color of the indicator LED makes a big difference.

If you are in the US, the device class features FAQ should be useful. The light switches discussion starts around post 40. Although that thread was started in 2015, individual posts have been updated all along, most information there is still current as of this writing, January 2018. As others have mentioned, there really hasn’t been anything much new in SmartThings-compatible switch technology in the last couple of years except for some new Zooz models which you may also want to look at.