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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Kings fall would be shit even if it offered 320 Y2 Gjally as a guaranteed drop. It's overly mechanical, which makes it boring, and there're too many jumping puzzles. The ratio of gunplay/gameplay to stand and DPS is too far off. The majority of the raid is spent doing repetitive jumps, or standing in one spot. The first half is fun. But once the boss bits start, it's basically the same encounter, slightly tweaked over and over.