swalker wrote:
I need to replace a 120mm case fan on my mid-size tower. Looking at
Amazon the prices are all over the place and I assume there might be
some differences, other than noise and air moved, between the top and
bottom price but I have no idea what those might be.

Opinion anyone?

Color doesn't matter.

Anybody like a particular brand?

1st: Noctua SSO2 (self-stabilising oil-pressure bearing).
2nd: dual ball bearings.
3rd: sleeve bearings.