Solid strap and retainers for the strap-case junction are the main things I'd say to look at. I have always used Suunto products, but that's for no-deco and some deco air diving which is a slightly different fish product to freediving. I'd check out the screen readability and the nature of the watch's freediving mode before pushing the button on it. Also bear in mind, the pressure transducer in them has a finite life and after 6 or so years it is on a finite lifespan. Once the pressure transducer is done it won't function - so if you are considering a second hand product factor that into the price you are thinking about paying (a lot of second hand gear is well used but some is more like a shelf queen, and could be a really good option it's just that the pressure transducer is always live and being an electrical device has a finite life).
Actual model isn't that critical I'd suggest too?
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