They are two of the most closely watched campaigns in the world today.
One is going strong after a quarter of a century while the other is a relative newcomer just beginning their seventh season.
Both inspire passion, obsession, joy and a fair share of sorrow – and both have plenty of casualties.
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Read more – Manchester United boosted in Ivan Perisic chase as Keita Balde nears Inter Milan move
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Analysis of Man Utd, Liverpool, Inter, Bayern Munich and Arsenal signings in action
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Alexis Sanchez wants to leave Arsenal – here’s how they could line-up without him
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Chelsea to lose out on Alvaro Morata to AC Milan and Barca to offer €65m plus Ivan Rakitic for Marco Verratti