I have my Garmin 935 and also just linked my Zwift to my Training Peaks account. I recently did this and yesterday I noticed that after a 2 hour LSD ride my TSS recorded in Training Peaks was 109 from my Garmin, but only 33 from my Zwift. My first question is, assuming I should only have one of them linked to my Training Peaks account, is which one should I use. My second question is why is such a wide disparity between the two. Thanks.
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It calculates TSS off of your FTP. So if your FTP on Garmin is 150 and your FTP on Zwift is 320 you don't get the same TSS from the same session