I owe mine to Dead Orbit. It was the shaders that won me over (and the decent weapons of course). I don't trust New Monarchy and FWC seems a bit messed up.
[spoiler]I'm also a loyal Vanguard/Crucible member.[/spoiler]
Edit: Thanks for the posts so far! Like the post to get it trending.
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New monarchy just because they gave me a shader within the first 10 levels so I -blam!-s with dem now Plus I really like red and white on hunters and Titans to a lesser extent