9mm vs. 10mm?

I am torn between getting a Stoeger Cougar 8000 in 9mm and buying a Glock 20 in 10mm. The gun will mostly serve as home defense and a "just for fun" gun. The 9mm is a very cheap round and the cougar is an inexpensive pistol, whereas the the Glock costs a little bit more and the ammo is fairly expensive. I am open to reloading to fray the cost of the 10mm. On that same note does anyone know how it costs per cartridge to reload 10mm. Ive had good reviews on both pistols, but I still cant decide.