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A 124 gr bullet is still considered relatively light (mid-weight) for 9mm. Not much difference between 115 gr and 124 gr from a powder burn rate perspective.
If you load more cartridges than 9mm I would recommend getting AA5 as that has wider application in other cartridges and bullet weights. If you only load for 9mm and 115-124 gr bullets then it really doesn't make much difference between AA5 and AA7. AA5 should have less muzzle flash as the powder will burn faster and more completely within the barrel.
I have used powders in the approximate AA5 range (W231, AA5, Unique, Universal) to load everything from .38 special, 9mm Makarov, medium .44 magnum, and full power 9mm, .40, and .45acp.
As noted above, cast lead bullets generally require a bit less powder than jacketed bullets, but you should check data tables for lead bullets, such as Lyman.
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