Beat me to it.LeathermanKick25 said:The graphics are pretty much the same. New Vegas is definitely far more than a "glorified expansion".
After years of playing both extensively. I think it comes down to.
Do you want the most focused and atmospheric game with plenty of content that doesn't feel like too much and easily all doable? Go Fallout 3.
Do you want a lot more freedom but a lot less focus in story and pretty much everything else overall? Go New Vegas. New Vegas has a fuck ton of content, but a lot of it isn't very interesting, there is plenty to explore though. However for the first 10 hours or so you're pretty much confined to a big linear path because you're far too underequipped and underpowered for most of the Mojave.
If it came down to one and one only I'd go Fallout 3. New Vegas is still an incredible game though. And 3 is definitely the one you'd want to go into first to get an idea how of Fallout games go.
3 has the better atmosphere, but New Vegas has(IMO) slightly better gameplay and a more open feel. If I was only ever going to play one of them again, I would play New Vegas, but it really comes down to whether you'd prefer the atmosphere of the more open world/sandboxy feel.