I was introduced to eating french bread dipped in olive oil and vinegar.. so I've gotten all kinds of vinegar in those little bottles to try.. red wine vinegar, white wine vinegar, rice vinegar, red balsamic vinegar, white balsamic vinegar (this is really good).. but I keep good ol' cider vinegar on hand as a basic vinegar for cleaning or laundry or making sweet and sour sauce etc.
I really like the flavor of red wine in my spaghetti sauce.. and discovered that even if I don't have wine on hand.. a smaller amount of the red wine vinegar will give a lot of the same flavor.