the main plot is the outcome for the mojave wasteland. the main endings is assisting with ncr, legion, mr house or independent. the legion is objectively one of the worst pathway to take. if you consider the main objective from the start of the game which is to get to new vegas, find and kill benny then deliver the chip which is to mr house so i consider the mr house pathway to be more canon in comparison to any other direction you can take in the game. the game itself even directs you towards the mr house or otherwise the independent questline whereas every other pathway you have to go out of your way to start the quest series which those quest series will also lead you back into the mr house or independent questline.
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