I have, by far, the best results on my small mill/drill with 1/2" solid
carbide tooling. Usually import and/or when on sale. I have purchased a
couple of sets of the import TIN coated mills and have removed a lot of
material with them, but for finish & durability, I still prefer the solid
carbide. I have on occasion purchased "top brand" american-made mills and
really can't say they out-perform any other HSS I've run. I'm sure in even a
moderately rigid machine they would perform better. In my case not so much.

I've tried the TNG insert tooling, on a lark. It was stupid. I just can't
get rigid enough to even come close.