Question: Who has won the most old firm games?
Disambiguated questions and answers: question: Which team has won the most old firm games?
Which manager has won the most old firm games overall?
Which manager has won the most old firm league games?
answer: Rangers Football Club
Rangers
Rangers F.C.
William Struth
Bill Struth
Struth
William Struth
Bill Struth
Struth
Natural Questions answer: Rangers have won 159 matches (from the Wikipedia article "Old Firm")