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rockmagnet said.....
Apple watch with the velcro strap. Helps if you are in the Apple universe. I use it for Apple Pay, loyalty cards, walking, cycling ,paddling , swimming,surfing, phone ,picking up chicks.. followed by heart rate ,arrhythmia, and emergency feature to call an ambulance.

I had the velcro band. It stays wet and gets a bit stained and grubby. It hooked onto my wetsuit sleeve and peeled open. I noticed and caught it just before it was going to fall off.
I liked that my missus could see where I was and in an emergency I could call for help. It's way more convenient and useful than a PLB.
You have to lock the screen when you're in the water. The drops activate the screen and make the watch do stuff. When you finish a session it is a pain to get it to respond until your hands and the watch are dry.
Battery life sucks. I could only record one session before the battery would be close to flat.
I had 3 Apple watches. One died and was replaced under warranty. The other brushed against the wall and smashed the screen. Apple sold be a new one for $248 I think. That one died too.
If I got another Apple watch I might go for the sapphire glass. That is much stronger than the normal glass. I have read that the next version of Apple watch will include a rugged model with longer battery life.
I have a Garmin Fenix 3. That is indestructable and has excellent battery life. I can record 3 days of sessions. The charge lasts about a month with the GPS off. I have had it since May 2016. I wear it all the time. It has sapphire glass.
I don't use apps. I think they're useless. You're stuck with doing whatever the app does and most of them do it wrong. Trying to look at a screen while you're out on the water is a bit pointless.
I just record my sessions and occasionally look at the duration or speed. I upload my sessions to Garmin Connect on the web. I can look at them and analyse the tracks and work stuff out.
If I want to do any detailed analysis I export the tracks. I can load them into a spreadsheet or other web tools. It's easy to graph speed and filter out all the crashes and gybes and stuff and be left with useful data.