My understanding is the HRM Tri includes the running metrics, which the HRM Swim lacks, so if tracking those things is important to you, you'll have to live without them if you run with the HRM swim. The Tri is also a bit more comfortable outside the water...the swim is less flexible, and doesn't "breathe" like the Tri does (porous fabric vs non-porous).
Also, the Tri is designed for "regular" water, not chlorinated water. Supposedly, chlorine will do bad things to the Tri if it's exposed to it regularly. I teach scuba diving, and I know the wetsuits I use in the pool, made of a fairly similar material, get stiff and start to break down when used in the pool long enough.
I don't think either would be bad in a pinch, but I personally wouldn't make a habit out of using either in the "wrong" medium.
As far as using it occasionally goes it would generally be only in bricks and races as Iâ€™ve been happy with my Tickr. My question is if I used the swim in a race, especially in aquabike am I going to be sitting up and adjusting, finishing with a shite split and saying â€śnever againâ€ť or will I just be working so hard I donâ€™t notice?
As far as oHR I have a 935 so unless it trickles down that wonâ€™t help.
I still lapped everyone on the couch!