Which crystals do you open more ?

So it's been a while since 6* dual crystals were introduced . People were demanding this since last 2 years and it finally helped many to hunt for some specific champs. But how lucky you all have been with the dual ones ? Do you just them now or stick to basics ?
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As an aside I don't really do featured ones either. I just caved and tried 2 6* featured and got Star Lord and Thor, both 1st pulls so even more useless without the dupes. I only tried feature crystals before with 5* when they had the Blade specific ones both times.
No luck with any of my featured attempts so I think that's it for me. It was a small amount of crystals overall but personally I don't like the gamble because the negative emotion for me with getting bad or undesired pulls is much stronger than the happiness would be of a good pull.