It's like buying a pint and drinking it alone at a pub, in one respect, having a good drink should be a social activity with friends and colleagues, in the other, you probably just one some quiet time to do what you want to do.
I'd have to equal it out, I think having friends with you can make the experience far more enjoyable, but then again, can sometimes be a pain when you've been together for hours and become bored of one anothers voice. I've done rides on my own, I often talk to other riders if need be, first time riding Hurakan Condor I was on my own, I was **** myself! So I started talking to the bloke in front, and he was **** himself too, we went on together in the end, so all was good!