It is really personal preference, but to give you an idea:

If the slides are NOT C.O.R.E. then
both listed handguns will accept the same sights and the sights don't have to be "Performance Center" rated.
Just look for Smith & Wesson M&P sights. (not "Shield")

I've been using few different bands, but Trijicon HD are the best for me. You may like them too.
You can look at Truglo TFX, which some people like better.

Good luck.