I think that FNV kicked FO3 in every single category except for exploration. FNV had a MUCH better story.
Fallout 3:
positivies
-Random incounters
-Exploration
-Character has background
-Better music
-Story you give a [censored] about
-Ingrossing atmosphere
negatives
-Unrealistic atmosphere
-Boring companions
-Black and white story
-Missing factors from the originals (Damage thresold etc.)
-Difficult rp
-too many glitches
Fallout: New Vegas:
positives
-Better compnaions
-Being able to rp however you want
-Better dialogue (I guess)
negatives
-Having no background at all
-Boring story
-Black and white story (I found the Legion eviler then the Enclave)
-20x more glitches then F3
-Boring, uninteresting, and generally uninvolving atmosphere
-Subtitles didn't match what they said 8% of the time
-Awful music
-No random incounters at all
-Feels too safe
-a very dull atmosphere
Fallout 3's pros outweigh the cons but F:NV had twice as many cons then pros.