Aesthetically I like 'em all. Each is fitting and interesting and I think a lot of folks gloss over or are unaware of many little details. The artistic design of the creatures and environments is one of Destiny's strongest points. The cabal are the easiest to subconsciously homogenize but they're alien space marines and there are a lot of minor touches between varying types and legions. Their vehicles are beyond oversized yet have a surprising amount of detail. I vote all because they are.