ok kat both of these are really good games. if your more of a shooter fan then we can stop right now cuz you should just pick fallout. but if you like hack & slash and fantasy games then go for dragons age.
both games have a system where you can basically pause the game and pick your moves. In fallout you can only do this a limited number of times per fight, then you have to wait for it to recharge, but in dragons age its unlimited.
both also have lots of customization options, especially for appearance, basically like any real RPG. but fallout lets you "make" your own weapons using schematics and random parts you find in the wasteland while in dragons age you can make poisons, runes, traps and a few other things depending on you class.
the graphics of fallout 3 are much better, but they aren't too bad on dragons age.
also dragons age has a squad based system where you can travel with other npcs while in fallout you can only travel with one at the most.
all in all i would suggest dragons age first just because i like hack & slash rpg's more than shooters
hope this helps
