The Highwaymen pretty much had one good song. I would say they are kind of like the 04 Lakers. As separates they were great players, but a little past thier prime and they couldn't quite mix together just right. I would have to say the greatest country group starts and ends with Alabama.
Oh hells yes !!!! They is bonified !! My real vote would be for Alabama, or a Southern Rock band like Credance.
I think the real answer is obviously Alabama. 32 number 1 hits can't be wrong. (southern rock is a whole different category... don't be throwing Lynyrd Skynyrd or CCR in this hat)