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gneve said..
I tried both Zef and Waterspeed with my Apple Watch and they were very similar. I settled with Waterspeed. There's a ton of features I would like to see (time on foil, VMG, auto-pause, better replay, map indicator for top speed, jibe count, tack count just to name a few). That being said, it has helped me track my sessions with a bit of stats. Not 100% sure about the speed accuracy but that's not solely the responsibility of the app as the hardware plays a big part.
Have a look at the web app. It has more stats, including tacks and jibes.