Don't base your string you get off the song you play, base it off the sound you want.
But if you want the geddy sound use rotosound RS66 45-105. If you want a string that makes it easier to play you might want DR Hi-beams or sunbeams, IMO those are the best playing strings
He did use the Rotosound PSD (I think it was) in a light gauge around presto, but now hes apparently back on the RS66 45 - 105 strings. Think that happened when he went back to the Jazz Bass.