Mannyrock,
That is a tougher question than it might seem. When factories make ammo, especially "Promo" ammo, they work up their loads for that lot. Things that come into play include what powder is available at the time of the lot run, and for what price. One lot might have a different powder than an identical box of another lot, so one could burn cleaner even though it is the same brand. While even the Winchester White Box ammo and its SB/Rem?Fed counterparts generally run clean, there will be variations.
FWIW, just my opinion, buy something priced right in a brand that you feel comfortable with, bang away, then take the thing down and clean it. Few guns are easier to clean than a 1911 (though you didn't specify that as the 45 acp that you'll be shooting).
