It depends on where you are playing. Most audiences like a mix of familiar and 'off the beaten track'. But a pub audience will probably want to hear a lot of familiar songs. Context is everything! And it helps, I think, to give a little commentary or background or at least a brief introduction before launching into an unfamiliar song. Recently a friend went to a pub to hear a very talented singer/instrumentalist who has a vast repertoire. I've seen her in concert, and she's excellent. But it was all lost in the pub. She sang unnacompanied, she sang in gaelic. The audience wanted to hear The Wild Rover.
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Old song is best song. It will never change. Long life will stay.