Also, I believe the Ultra has an enhanced microphone and two speakers that are louder for outdoor use in the elementsI’m ‘upgrading’ from the Ultra. The 10 has a slightly bigger screen, screen also goes down to 1hz and is now wide angle. Not as bright as the Ultra but not sure I’ll notice tbh. Also has a better SIP, far thinner and lighter, which I’ll appreciate as I wear my watch in bed for sleep tracking all the time.