I’ve been shooting both 9 and 38 sc and I have developed a preference for the 9. 38 sc does seem slightly softer, but for me the decision has much has to do with the time it takes to reload.
Of course, the lower cost and benefit of not picking up brass are big factors, too. Plus 9mm is about the only cartridge I use except for .223. But mainly I don’t always have the time to reload and after spending all week in the office I may not want to reload. I’d rather relax. So, there are some weeks where I will just buy 9 major and use that in matches. 9 major from Black dot ammo out of Alabama has been good for my gun. And it isn’t cost prohibitive. So, not having to reload adds to my overall enjoyment of the sport, but if I need to do it I will do so to keep playing. I just like to shoot!