Win 231 is my go to powder for 124/125 gr lead boolits. 4.1 gr makes PD for IDPA and is very accurate in all my 9MM guns. Unique is a close second but doesn't meter as well. When you are loading 10K - 20 k rounds a year of 9MM for competitions it is nice to have a powder that drops consistent leads from your powder measure. Other powders that work well in the 9MM are Universal and HS-6.
I have a Clays load that I use for my 154 gr boolits in 9MM. 2.6 gr works well to get to a PF of 130ish, enough for IDPA.
Take Care
Bob