The Symmons valves are excellent valves, they've been around for years.

But their trim kits are more functional than stylish.

I don't have any broad knowledge regarding what trim kits can fit other manufacturer's valve bodies. What I've had to do on the past is to look at the dimensions on the valve and trim kit spec sheets and compare.

Tedious for sure.

If you have a simple valve you have more options than with a multi-function valve.