Gboard is the best peck typing and finger swypojg keyboard sadly. SwiftKey is a close runner-up. I had been using gboard with pretty much all the regular permissions active except location contacts and the questionable ones, but I had network on for the GIFs.
Very recently however though I have made the switch almost entirely to swiftkey, there was a singular instance where gboard suggested two emojis that a friend of mine would use every now and then that are not placed next to each other in the normal Emoji layout.
Now, this very well could be simply because I had network access on, but I had every other analytic and "improve for others" features disabled. I've never seen Gboard suggest emojis like it did and it's never suggested accurate text or predictions. But once I saw that I get why people fret on Gboard.
Sucks it's quite literally the best keyboard.
Ironically iOS Gboard and SwiftKey sucks ass.