The digital is a little cheaper, but then the only ways to acquire games is either a PS Plus subscription or by buying games on the PS store. The disc version costs $100 more, so you might save money in the long run as used games go cheaper faster than digital discounts.

You can't put PS3 discs in, but the PS Plus Premium subscription has a lot of PS3 games you can play via cloud. It costs $17.99 per month (and not really worth it in my opinion).