I personally think that KF has much better mechanics than VoG, but all the year one players want to pick VoG because they can take pride in being the first to step into it. It's loot was arguably worse than KF because if you were missing even one piece (which a lot of people were), you were stuck doing a ton less damage than the lvl 30s, whereas 315 vs. 320 is not too significant in damage difference. Sure it was big and gave a sense of plunging deeper and deeper into Venus, but most of it was empty space with nothing important.
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KF is actually pretty great with the mechanics. It was also cool to really explore the belly of the Dreadnaught. VoG will always hold a special place but let's be real, it's not head and shoulders above. Maybe only just by a little.