I used all three at one point in time. What I love about homebrew is that the tedious work of maintaining a sane package repository is distributed over many shoulders (3429 at the moment) - and those who contribute most of the time do really care about the packages they are watching over.

I haven't found an easy way to add/update packages to finc or macports, but I could contribute to homebrew within 5 minutes.

I wish we would see more work distribution patterns like this in fields outside code/programming.