We're so used to being listeners instead of singers, I suppose that's why we name other people and their versions. Maybe this is more like "what is your favorite song to sing?" Or maybe this is about who we fangirl at. No criticism, because I do it too, but the direction this thread is going is about consumerism more than anything.

...and I vote for Gaughan's version of Hamish Henderson's "51st Highland Division's Farewell to Sicily", although that ain't traditional either

Otherwise, it's pretty silly/impossible to have one favorite. It's whatever song is happening at the moment.