How to determine what mobo/cpu grouping would be better? Question in theory

[cbr600ds2]

Ok so the best part about unraid is that you can use fairly old hardware to get pretty good performance.  That was my first build and then a few years ago I made a Ryzen 5 build.  It's still doing great but I've just been throwing some ideas in my head.   What's the best/easiest way to determine performance for an Unraid build?  

 

Do y'all just go to userbenchmark.com and use that?  I don't have to upgrade atm but I sort of want some more different things that my build doesn't have now and I'm trying to weigh the cost/benefit of doing that.