For the past 9 years I’ve been using a Garmin watch while swimming. Back then I had a swim-focused watch, now I have a multi-sport watch. Most days the biggest benefits are the fact that I can pre-load a workout (so that I don’t need to print one out or keep my phone nearby (while keeping it safe from water) and the fact that it counts my laps for me. As I wrote 9 years ago, by releasing my brain from keeping track of laps, I can better focus on my technique.