Any good ones about free preferable to try out. I updated my Nexus 10 a few days back and the keyboard is a dog and a complete headache. If it doesn't know the word tough st your having one it does know especially if you need a full stop after it.
I also use the Google keyboard (on my LG G4) and after the last update it is infuriatingly bad! I can't even pick one thing - they have made lots of changes and each one is utter crap.