I didn't name one favorite back when this was a new thread, kind of for the reasons stated by Stringsinger (Frank Hamilton).... but since then I would put one name up as a singer who does such justice to more songs than I can count that I'd consider him to be as close to a 'favorite'

Danny Spooner... it is always clear who it singing, but it is always about the song. He has a huge repertoire of traditional songs, but can make even recent songs sound like..... well.... like 'folk'.