I would definitely go for a 9.3x74R over a 9.3x72R any day of the year! I assume you are aware of the difference between the two cartridges. If not, the 72R is basically a BP cartridge (or nitro for black). You find cheaper drillings, combinations etc in 9.3x72R because it is a less desirable chambering for modern use.

The 72 mm Rimmed round is not in the same company as the 8x57R or 9.3x74R.

A search on "9.3x72R" on NE will no doubt give you some ballistics and more comments.

Good luck in your search to re-equip your gun rack.