New Vegas for sure.
I couple people have mentioned the DLCs, but honestly Old World Blues is the single greatest piece of DLC I've ever played- It's got great characters, a smart and funny plot (potential spoiler: I saw The Physicists at the Stratford Festival a few weeks back and was struck by the similarities), and a ton to do.
I'll say that New Vegas does have a more empty enviroment, but that's more a function of you being in a large desert rather than a section of a bombed-out city. Still plenty to do out there. Also, it's not super-railroady if you don't want it to be; on my first playthrough I made a full circuit of the map before I even went to New Vegas itself to continue the opening part of the main quest just by staying away from Deathclaws and Cazadors until I goot some decent weapons, and I don't regret it or think it was a real grind. The unleveled enemies can be a pain, but I prefer that more organic feel. YMMV.
I couple people have mentioned the DLCs, but honestly Old World Blues is the single greatest piece of DLC I've ever played- It's got great characters, a smart and funny plot (potential spoiler: I saw The Physicists at the Stratford Festival a few weeks back and was struck by the similarities), and a ton to do.
I'll say that New Vegas does have a more empty enviroment, but that's more a function of you being in a large desert rather than a section of a bombed-out city. Still plenty to do out there. Also, it's not super-railroady if you don't want it to be; on my first playthrough I made a full circuit of the map before I even went to New Vegas itself to continue the opening part of the main quest just by staying away from Deathclaws and Cazadors until I goot some decent weapons, and I don't regret it or think it was a real grind. The unleveled enemies can be a pain, but I prefer that more organic feel. YMMV.