I prefer the 124 since it’s more readily available. It also shot well with my sig pistols. I loaded it with 4.0-4.1 Gr of win 231 and sport pistol at 1.120.1.125 OAL.
I'm loading a little hotter, 4.4 gr - 1.12 for the 124 and 1.10 for the 125(used P01 barrel to make sure CZ friendly). Chrono'd 15 rds ea, avg 1094 fps for the 124 and 1051 for the 125 from a Glock 19. ES and SD about the same for both, not that it really matters to me. Didn't notice any difference in accuracy. Thinking of ordering the 124s since I can load longer due to ogive.