Probably 40-60 split only because of my location and knowing many people who are into snowboarding. It's fun with friends on long weekend trips because you can party it up after the day is done. For day trips or an over nighter I don't really care if I am going alone.
Riding with friends (who are better) tend to get me trying new trails or push a little harder, but I find it much easier to work on specific techniques alone since I can focus.
“I train every day of my life as they have never trained a day in theirs.” – Alexander Karelin