Anything in the 1.18+ range of voltage and over 400sec of runtime on a 30amp discharge.
Or 1.17+ and 370sec on a 35amp discharge. and always a low IR.
I use Orion and Promatch but other great matchers are
SMC.
Fusions I still use one of theres.
Yokomo if you can find them.
Keep this in mind when buying matched cells
1) Is the company a name that has been around for years?
2) Are the prices reasonable?
3) What are the guys who are winning with running.
I like what I like but if you ask such a general questions you are going to get a large pool of opinions.
Go to the websites of major matchers and read up.
Hope this helps.
Stephen <><