Maybe just try a set of two bags - one Vanilla, one Chocolate - and see if the taste suits you?
The Essential bags are slightly larger - 2 bags = 45 × 400 kcal - compared to the Powder bags - 2 bags = 34 × 400 kcal - so you’ll get a “longer trial period”.
Content-wise, as far as I’ve understood, all essential (←) vitamins etc. are there, it’s just the protein/carbs percentages that are different (less protein, more carbs),
and depending on “what you’re after” this might just be what’s “right for you”.
(image below from NEW Huel Essential Powder for just £1 a meal! )
If you find that you “need the probiotics”, or some of the other stuff that makes Essential differ from Powder or Black Edition, maybe compromise - buy both, and mix them?
Also: Don’t forget to try mixing the two Essential flavours (try Vanilla, try Chocolate, but also: try ½ Vanilla + ½ Chocolate). 