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It’s one of many age old debates between Rangers and Old Firm rivals Celtic. Heck, it might even be the biggest one. With Celtic edging excruciatingly closer to Rangers’ world record league title haul, the subject of European football remains a hot topic of debate. Both clubs have one European trophy apiece and both have been regulars in European competition over the last seven decades. But only one of Glasgow’s Old Firm duopoly can be crowned Scotland’s most successful club on the European stage and according to a leading Swiss data football site, it’s barely even a contest. READ MORE: Ranger…