@Speed-Man Maybe I haven’t explained myself clearly but I do know the diferences between both technologies, and as I said I do use the chest strap when I want to have the ZoneSense information, for the rest of the cases I use the OHR armband.
Previous to my SVTS the wirst OHR was very bad for me and the chest strap makes me a nasty sore during the hot months of the year, that in my area could be from April to October. With the SVTS the wirst OHR has improved greatly but it still fails a lot of times for me, the armband is very comfortable and convinient for me.
Regarding the accuracy, bpm values are at par with the chest strap in most of the ocasions except in interval sessions where it lags behind the chest strap, not in the values but in the responsiveness.