Actually. Most call reach non-canon.
But really, both versions can be fit in.
Anyone who is a big fan of halo- I'm a big fan of destiny too, mind you- knows the books are, unlike must games, prime canon. The books and the cutscenes.
English
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It was stated by bungie when reach came out that the games were prime canon (unsure now that 343 is at the helm)
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Yeah, it's different with 343 now