I have see that on Steam there are a lot of games for Mac (multi-platform), do you think that is better buy on Apple App Store or on Steam? I never buy on Steam but I had see that the price are a lower respect to App Store.
I boy from both. I thinks Steam is more portable than the App store as you can also get games to play in any other computer OS. Steam provides great discounts almost every week, and many free weekends to play and try games. I like steam.
Steam!!!! Although I am a big fanboy of steam.
It's cross platform, and many steam sales. Many games I've bought on steam have been because of very low prices. I got NFSHP normally $70 for $5 during a steam sale.
Steam is often cheaper, and as noted the games are cross-platform. On the other hand, it's often buggy, and you need to launch the Steam client to play your games (they don't go into the Applications folder like software from the App Store).