What oil filter do you run and why

Mobil 1 and K&N look the exact same.

aFe and Royal Purple look the exact same.

Advance, PowerFlo, Pennziol, Purolator and ProLine look the exact same.

Is this a coincidence or are most filters just made by the same couple of companies?

The only filter I've consistently read bad things about has been Fram. There was a funny argument on here a while back with Dan and a guy who either works for or has a hard on for Fram. Dan posted the facts about Fram's bad quality and the guy responded with "proof" that consisted of a video of a Fram rep talking about how great Fram was lol.