A regular challenge that I face is balancing two (or more) logos. Whether they need to be equal or one needs to be given priority. Some logos however might be squares, others rectangles, circles, etc...
As a quick sample I snagged a nice high resolution photo from Unsplash and pretend its going to be an advertisement that needs to show some footwear brand logos on it. In this case I used Adidas and Saucony.
This is certainly not balanced even though they're height is the same:
Likewise this is not balanced even though they're width is the same:
So then the question becomes when are they in balance, is this balance:
Maybe a little more adjustment, is this balance:
And in these examples I'm only working with two Black Logos. Factor in color and it can get even more difficult to balance. Another issue being when there's tiny text as part of the logo.
So the question is, other than estimating / eye-balling it, what tips, methods or even tools are there to balance different sized logos?