For those that don't know (I had to look it up) here are the differences per wikipedia:
The BFG Edition features enhanced graphics, better sound with more horror effects, a checkpoint save system, and support for 3D displays and HMDs. The game also includes the previous expansion Resurrection of Evil and a new single player expansion pack called The Lost Mission. Additionally, it includes copies of the original Doom ("The Ultimate Doom" edition with add-on fourth episode, Thy Flesh Consumed), and Doom 2 with the new episode "No Rest For The Living", previously available for Xbox 360. The BFG Edition also features the ability to use the flashlight while holding a weapon, in the form of the so-called armor-mounted flashlight. The PC version of Doom 3: BFG Edition will require the Steam client and a valid Steam account for installation, play and achievements.
Slickdeals is able to share the best deals because of the contributions of users like you! If you found a great deal,
please share it with others by posting in our forums.
Welcome to Slickdeals!
Save money here by finding the lowest and cheapest price, best deals and bargains, and hot coupons. We're all about
community driven bargain hunting with thousands of free discounts, promo codes, reviews and price comparisons.
Don't worry, we'll help you find your way. If you haven't already, check out this
that explains the features of our site.