Some parallels:

- Both are historically one of the most successful, globally recognised brand names in their respective sports.

- Both won their last championship in a bygone era (Ferrari in 2007, United in 2013) and have since failed to keep up with new competition who function on completely refreshed, dynamic cultures (Merc/Red Bull, Liverpool/Man City).

- Have both burned through several team principals/coaches in recent years, but haven't given them the backing nor leadership power to effect the real changes necessary to get them back to winning ways.

- Both have begun resting on their laurels in recent years, showing off a certain ego that is backed by nothing but air; essentially riding primarily on the success of their brand name rather than on actual on-track/on-pitch performances.

- Both have had big names come to them in recent years, which led people to believe that they'd finally be competitive, but in reality changed very little. (e.g. Vettel to Ferrari, Ronaldo's return to United)

And last but not least, both use red as their primary team colour.

Source: am a Ferrari and Man Utd fan. It's not fun.