I played both when they came out, and played both to exhaustion, so here goes...
Fallout 3 had some of the most interesting world design that I've seen before or since. I loved exploring every nook and cranny of the game. I loved Megaton. Also, the radio was pretty dang good, compared to FNV, and Three Dog was way more fun than "Mr. New Vegas" ever could be. That being said, the writing pretty much sucked across the board.
Fallout New Vegas had amazing story, characters I actually gave a crap about, and made great strides in game mechanics. Granted, most of the mechanical improvements were just building stock versions of the most popular FO3 mods, but honestly... I wish more games would do that. On the other hand, the Mojave is boring as hell in real life (I lived in the area for a couple years), and the game's version... isn't that much better. It certainly had its moments, but I truly missed the Capital Wasteland at times. Likewise, the forced directionality (is that a word? Eh, whatever) at the beginning kinda annoys me as well. I'm the sort that likes to take a hard left off of the plot-trail as soon as possible in any open-world game, and FNV just really didn't let you do that. Try taking a hard left off of the rails here and you get eaten by deathclaw 5 minutes into the game.
So yeah, FO3 wins on world design and pacing. FNV wins... pretty much everything else.
Fallout 3 had some of the most interesting world design that I've seen before or since. I loved exploring every nook and cranny of the game. I loved Megaton. Also, the radio was pretty dang good, compared to FNV, and Three Dog was way more fun than "Mr. New Vegas" ever could be. That being said, the writing pretty much sucked across the board.
Fallout New Vegas had amazing story, characters I actually gave a crap about, and made great strides in game mechanics. Granted, most of the mechanical improvements were just building stock versions of the most popular FO3 mods, but honestly... I wish more games would do that. On the other hand, the Mojave is boring as hell in real life (I lived in the area for a couple years), and the game's version... isn't that much better. It certainly had its moments, but I truly missed the Capital Wasteland at times. Likewise, the forced directionality (is that a word? Eh, whatever) at the beginning kinda annoys me as well. I'm the sort that likes to take a hard left off of the plot-trail as soon as possible in any open-world game, and FNV just really didn't let you do that. Try taking a hard left off of the rails here and you get eaten by deathclaw 5 minutes into the game.
So yeah, FO3 wins on world design and pacing. FNV wins... pretty much everything else.