Should you always update Minecraft – Pocket Edition?
Well, lets tell you my story (which is actually real) about Minecraft PE 0.13.2.
One day, I updated Minecraft PE to 0.13.2. I launched it, and it crashed before it had launched. One day, it had downgraded me back to 0.13.1 so I could play again. Then Mojang re-released 0.13.2. It ran this time. Wow! All those bugs fixed.
You should always look at reviews for the latest update (unless you are a Beta Tester, you can send private feedback to Mojang through the Play Store) before updating!