No offense taken haha DocumentDB is a great DB, but in the end of the day it's a forked version of 3.6-ish so it's missing a ton of new features like multi-col

No offense taken haha DocumentDB is a great DB, but in the end of the day it's a forked version of 3.6-ish so it's missing a ton of new features like multi-collection ACID guaratneees. Plus, whenever you use DocumentDB you're accessing it via the MongoDB official drivers, so you'll be handling that compatibility mess yourself.