I'm very much late to the party, but as of now, I yesterday switched to Fleksy and I'm typing this with that keyboard right now.
Gboard sucks in my opinion.. Many times tried switching from gboard and always failed. I dislike that Fleksy always shows letters as capitals on its keyboard layout, but love its word suggestions. I think I'll eventually learn how to use it. I'm one of these guys who are called "power users".