To put my Phoenix into more context. After the 2019 Phoenix event and the following FA, I had enough artifacts to max the Fire and put out the Storm at level 6. During the 2020 Phoenix event, I got enough artifacts to max the Storm and have 3 left over. I do not think I even fed the Storm once until I was into chapter 14, and it was still level 6 at that time. That 30% boost to the MM bonus, especially when I applied it to productions I collected and used right before the nightly decay, saved me many days of sentient production. The funny thing is that I have fed it less often after getting it to level 10 because the last couple of chapters had other things to slow you down than waiting to get sentient goods. I also don't need to use it during FAs because my fellowship only worries about completing one path per stage, so the new version of the bracelet is not an issue for us. Going back to the comparison, if you only look at the 48 hour collections, a level 10 Aureate is good for one bracelet badge per collection, for me in chapter 17, but not enough on it's own to complete any of the event goods collection quests. And since I am loaded with tier 1 goods, the mana and 2 KP from a level 10 Storm is worth more to me. But having to choose does not matter to me any more, as I only need one more artifact from the Spire to have all three at max level.
And now that I have my Aureate out, I can more easily compare the feeding bonuses.
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The AW boost is a level 11 MH, the pet boost is the 250% from a level 9 Aureate and the enchantment bonus is the 125% total from MM, level 11 ETC, and level 10 Storm. The Aureate only gives bonus goods using the regular production, as 3225 is 250% of 1290. The MM/ETC/Storm combo gives a bonus on all other sources of goods. That 18,093 is 125% of the other four numbers added together. So the MM and fed Storm will always give a lot more goods than just the fed Aureate. Also, the Aureate does not give extra boosted sentient goods when fed, only normal boosted goods, while the Storm works on any goods you place an MM on. That makes Storm easily the winner when making sentient goods.
And yes, I burned two pet food and two MMs to check all the numbers.