I've always preferred aluminum. It's easier to control temperature. You can dunk an edge of it if it's getting too hot and it won't crack, just cool a bit. I have only one mold out of several dozen that's not a Lee mold. It's a brass .31 caliber mold I got from Dixie that throws a round ball and a conical in each of two cavities.
Round ball is cheap, though. I have the Lee 220 grain .457 conical and a hollow point version of it for my Old Army, all I shoot in it. Super accurate and packs a punch. Not sure how much use the hollow point is, but I had to try it. Problem is, the cavity is rather small and shallow.