I ride alone a lot because everyone seems to have opposite shifts to me.
I prefer riding with someone else as I can explore more (trees, areas that I have not gone before that could dangerous for solo riders) and also I am more likely to try things if someone else is also trying them or are more advanced and can help me out. Often I cannot gauge what I am doing wrong technically if I am by myself.
If I am having a bad day and am riding alone I will probably call it a day instead of keep going. If its a powder day I do not mind the serenity of riding alone.
I ride: NS Pandora 146 + Salomon Absolute premium Bindings
Stepchild PMS 149 + Nitro Eris Bindings +15 -15
Nike ZF1 5.5 & K2 Contour 5.