I prefer riding with my mates for company and safety, but I’m quite happy to head off into the hills on my own. Also as mentioned, family life means opportunities to ride are often at short notice, so can’t always coincide with others (especially if they have kids too).
These days I do tend to make sure someone knows roughly where I’m going though, especially if conditions are iffy.
As a ratio, I guess 60% with company, 40% solo