Perfect Dark 
Halo Overall Comparison Perfect Dark innovated about a hundred times more than the Halo franchise ever did. Perfect Dark has dual-wielding of the same weapon, Halo has no dual-wielding. Perfect Dark has alternate modes for every weapon, some quite different from the main function, and Halo does not. Perfect Dark has many more unique and fun weapons, Halo has very few weapons. Perfect Dark has amazing in-game music, Halo only has a decent main theme. Perfect Dark has a fun, replayable solo campaign, Halo has the Library. Perfect Dark has Co-Op and Counter-Op two-player modes, Halo only has Co-Op. Perfect Dark has many more options for multiplayer such as customizable avatars and bots and fun levels, Halo has palette swaps and Blood Gulch. I still play Perfect Dark with my brother, and Halo sits in a stack gathering dust.
The only advantage Halo has is system link for up to 16 players, which is indeed amazingly fun.
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Comments
Man! Perfect Dark was a legendary game... And it seemed to go amiss on the Nintendo. I used to love the fact that you could have loads of bots on the levels, and the weapons were so cleverly made! I loved the laptop guns... and the farsight sniper rifle with its psychodelic colours!
Halo was just kind of empty for me, it had a clumpy control system, and the characters felt heavy and unflexible. The weapons were mediocre, and the maps were dull. Give me Perfect Dark any day!