Vertical, Race and Race S have slightly different antennas.
Tests show, that the SNR is not consistently better of worse for one or the other model.
As you can see from my above activities, I have never had any problem with all Suunto models and got perfect tracks and distances.
It maybe is a personal swimming style issue as well…
Next FW update will also contain GNSS improvements again - just for me myself there is not much to be improved