I have found that the hit of brass is softer than steel. If you like to feel the hit a little more , I go with brass. It does go with the looks of the cue also. You want an even flow with your designs. Like alaskin said , silver with silver , ect.
But I think if you want a real solid hit , steel is where that hit is no matter the pin size. But for more orf a feel when you stroke , brass is the answer.
Just my 2 cents , hope this helps.
Jim
J&D CUSTOMS