The other side of the coin noun phrase
Used to refer to the opposite aspect of a subject or a situation
I like wearing white clothes, but the other side of the coin is that they easily get dirty.
Sometimes, I get lonely when living alone but the other side of the coin is that I have amazing freedom.
Working as a freelancer gives you flexibility in work time, but the other side of the coin is that you don't have a stable salary.
Holding opposing opinions on an issue or in a situation
The expression is used at the beginning of a competition to say that you hope the most fastest, strongest, or most skilled succeed person
wins.
I know you've both worked very hard for this competition. All I can say is, "May the best man win".