Pretty much in line with what Lucas and Vivien mentioned, here are a few of my favorite cutters from CNCFraises:
A long reach 1/8" one I bought to mill tall pieces with tight inside corners back when I did this
For aluminium, I’m a sucker for single-flutes and found these two to work very well:
And finally my workhorse for…pretty much everything in wood, is this 6mm 2-flute:
