My favorite is the Dreadnaught because of the Hive Architecture and the insane amount of loot opportunities (chests that require keys).
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Venus It is such a diverse landscape. Between the natural formations (caves and rocky cliffsides), Vex architecture, Ishtar Collective, and a Fallen Ketch, there is just soooo much to see on Venus. It's no coincidence that it also houses three of my five favorite Crucible maps, three of my five favorite Missions, two of my three favorite Strikes, and my favorite raid.