Which end mills are best for aluminum?

I’m getting ready to do some test cuts in aluminum using 1/8" end mills, but I’m wondering if I should use a single flute, 2 flute or 3 flute.
The cuts will be about 4mm in max depth in multiple passes.

What are some good starting speeds & feeds?

I would go with a single flute upcut but it all depends on what feature your cutting…