My favorite Crucible arena is Firebase Delphi. It's tight and compact and the location of control zone B brings a lot of players to one area, which always makes things interesting. First Light is another favorite of mine because of the opportune sniping locations, and the turrets are fun too.
Feel free to comment about your favorite(s).
Note: I realize Exodus Blue is a PlayStation exclusive but I included it because I thought it might be one of the more popular maps.
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I like the mercury map but i might be the only one lol