Hrm run or tri? Strength training

I personally prefer the HRM Run over the Tri as it is more comfortable for me.

Go for whichever costs less, they both work the same for strength training. That said, if you ever think you might want HR whilst swimming at a later date, then investing in the HRM Tri now might save money down the line.

I have both the HRM Run and the Tri chest straps and use both regularly for running and Crossfit.

There's no practical difference for strength training between the two. They both use the same type of strap so I don't expect the tri will be any more resistant to wear and tear than the HRM Run. I'm on my second Run strap now but the first one lasted a little over a year before it wore out. I was using it almost daily so I don't think that was too bad. It would be better if the strap was replaceable but they are more comfortable than other chest straps so it's a pro/con situation.

One thing to keep in mind (though your experience may vary) is because the Fenix 5 and 5S have poor bluetooth/ant+ reception you may sometimes get drop-outs during your strength sessions.
I never get dropouts while running, but in Crossfit if I occasionally get HR drop-outs in situations where my hand is fully extended away from my chest (like during a snatch or even sometimes during burpees).

I don't think there is any difference in physical design between the straps. The main difference is that the HRM-TRI will store and later forward your HR data if it doesn't have a connection to the watch, while the HRM-RUN will send live data only. The HRM-TRI is useful where you don't have a connection to the watch - eg. swimming, or contact sports.

The price difference is less then 18€... So I'm tempted to buy the hrm tri.
The hrm only stores hr data from swimming activities, or stores data for all kind of activities? If so it's a good idea to go to hrm tri because of the poor Bluetooth/ant + comunications

The HRM-Tri provides offline data recording for all kinds of activities.

The price difference is less then 18€... So I'm tempted to buy the hrm tri.
The hrm only stores hr data from swimming activities, or stores data for all kind of activities? If so it's a good idea to go to hrm tri because of the poor Bluetooth/ant + comunications

You can download HR data for any activity when you've used the HRM Tri which will over-write any HR data collected during the activity. It messes with the Training Effect scores though. Nothing with Garmin is 100% perfect!

You can download HR data for any activity when you've used the HRM Tri which will over-write any HR data collected during the activity. It messes with the Training Effect scores though. Nothing with Garmin is 100% perfect!

How does it mess the training effect? I've not noticed anything with the HRM-Tri which means I probably missed it and not aware of faulty values... great another bug...

It's something that only happens if you have an activity with HR data already collected. Or perhaps that's the only time it's obvious? I've seen it before where out of curiosity I downloaded the cached HR data to my activity and it changed the Aerobic/Anerobic TE scores.
There seems to be a problem with the HRV values that the Tri caches vs those that it broadcasts live.

https://forums.garmin.com/forum/on-the-trail/wrist-worn/fenix-5-5s/1315988-aerobic-anaerobic-data-with-hrm-tri

Thanks, I will pay attention to that then, in my case I'm using the HRM-tri in my treadmill workouts, and sometimes strength workouts, and at the end it usually says "downloading HR data" in spite of recording/transmiting during the workout (probably to fill gaps of data) so that may mess it up.