I like both...probably do more solo. Most local riders are considerably younger than I and, if SERIOUS RIDERS, when the pace picks up, I eventually get spit out the back. Otherwise, group riding can be fun flying along as one-- laughing, talking, teasing. Group riding can be a help on long, "painful" rides; they're another focus besides how much my butt, back, legs hurt. What is less fun is when some needy personality loses the "group esprit" and pushes just to dominate others--riding in the ego-feed zone. Riding alone isn't so much anti-social as liberating in many ways: ride your own pace, think your own thoughts, follow your own whim. Good to strike a personal balance of both.