I had a Garmin 3 hr, which I liked. But returned it because the watch kept losing time. Some days it was 2-3 minutes slow, sometimes 10 minutes slow. It was easy to fix, just sync with the Iphone app or do an outside activity tat requires sattlite. I figure though that if you pay over $300 for a watch it should at least be able to keep accurate time.

Now I am thinking about getting either the Forerunner 935 or Fenix 5. My question is do they keep accurate time or is it going to more of the same - sync with phone or connect to satellite to get accurate time? What is your experience with aforementioned watches?