Don't take it the wrong way...but the choosing th best mic for country is just like choosing the best mic for anything...what fits best.
There's lot of information here about the topic, but to save you some time, I have used/know of others using any or all of the following:
SM7, RE20, AT4050, AT4060, AKC C12, Brauner Valet, Gefell M930, Neumann U47, U67, U87, M49, M50, RCA DX 77, DX44, SK46, Electrovoice RE15/16, SM58, Sony 800G, Manley Reference, Peluso 2247, Peluso 2251, AKG 451, Shure 555, and millions of others...
Just 'cause its country don't change the mic selection rules: use what sounds best for the source.