So finally got a chance to try these three sleds on the hill head to head. 2019 Polaris 850 with 163 2.6", Alpha with 165", and a 2018 Doo 850 with a 165 3". Fresh snow on the hill, each sled taking it own track up the hill. Very close between the Alpha and the Polaris, but sorry Doo guys, the 850 Doo was out matched. The Polaris did get the high mark today, but was not by much. Not sure if the Doo was not running right or not, but it was 80' below the mark. It is very impressive to see what these stock sleds will do these days.