Unless you're at a very tough venue where only a certain type of music is expected, you're probably best off performing material that you are comfortable and enthusiastic about presenting, which will probably include the "old" stuff you were doing years ago (unless the only way you can do 'em is in a "lackluster" manner).

I firmly believe that audiences, consciously or not, react more to a performer's "vibes" than to the material being presented (its genre or whatever).

Try to find selections that YOU will enjoy playing, whether old or new, familiar or obscure, etc., and that'll be your best shot.