I think everyone knows at this stage whos bigger, its Celtic, this is mainly because of the world wide support Celtic has from the Irish who have emigrated and second, third and fourth generation who would align themselves with anything Irish. Celtic is more than just a club and they have made friends throughout Europe whereas Rangers have tarnished there name throughout Europe.
As for whos better its tight: Rangers have more leagues but Celtic have won the more Scots cups and the big one in 67