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rhb
As TW says, there's the ability to store the data whilst it can't communicate with the watch.
But there are two other major features (one required, one useful).
Being waterproof is definitely a requirement. Not all HRM straps can survive full immersion in water, they'll survive getting sweaty but not immersion.
The other difference is to do with the stickiness of the strap. With the Garmin straps, the HRM-Tri strap can do all of the above but if you wore it in the pool it would slip down your chest each and every time you pushed off from the wall to start a length. The bright blue HRM-Swim strap has a wider strap made of stuff that clings more to the skin, so it stays in the right place when you push off from the side. It's still comfy though, I've worn my HRM-Swim for many a 1h40 swim with no irritation.
If you're doing open-water swimming then a HRM-Tri strap would be fine (except for any initial dive in), if it's worn under something (e.g. a tri-vest or wetsuit) then no problem with that.
Anyway, running. Avulsion fracture of the medial mallelous from playing 5-a-side so I'm off running (and 5-a-side obvs) for a few months whilst the physioterrorist sorts that out - can also get my dodgy hip flexor strengthened too.