As it is often said in the music world, "Play it like you feel it." In other words, do whatever sounds good to you. I will add, though, that I think it is difficult to do folksongs in choral arrangements without their becoming what is, in my opinion, too polished-sounding. Sometimes this works and sometimes it doesn't. Fred Waring and his Pennsylvanians did Lolly Toodum and the Robert Shaw Chorale did Aura Lee rather successfully in my opinion. But don't get me started on what Mitch Miller did to folksongs! I guess it is sorta like 101 Strings playing "Hits Made Famous By The Beatles". Some things just don't work.