I haven't had a good group experience yet but maybe when I'm a better rider. I'm in that "no man's land" -- not a beginner any more but not strong enough to keep up with the intermediate riders either.
I enjoy riding with my husband but we go once a week or so. I wouldn't want to ride with him every day because he'd either be dropping me or having to hang back for me -- neither makes me very happy!
So I'd have to say I prefer riding alone for now.