.30sc all the way.
One of the 30SC’s big selling points is extra round capacity. This it does but only by one or two rounds, but an extra 1-2 rounds of .30SC is equivalent to 50-100 rounds of 9mm. Modern hi-cap 9’s carry quite a few rounds already, but they aren't. 30 super carry. One or two more really doesn’t mean much, but that doesn't take into account the inherent superiority of .30sc. The 30SC gets its ballistic performance from very high chamber pressure. The resulting muzzle blast, flash, concussion is unpleasant, but you want to know you've touched off such a magnificent round, especially in an enclosed space such as an indoor range. Said bluntly it is an obnoxious thing tofiree, obnoxiously cool.
Ammo selection is limited, but it's .30SC. 9mm beats this all to heck. 9mm has dozens of bullet types and brands available. You can even go to +P if you just gotta. And it still won't be .30sc
You’re going to want to shoot the thing. Go with the more practical caliber.
Resale: good luck or selling or trading a 30SC, though you won't need it. Everyone already has a dumb 9mm.
Glad you agree!