I always just mix single flavors because it gives me much more flexibility in what I want to
vape each day. Sometimes it may be a strong bourbon with a slight twist of lemon, another day a lemonade with a small shot of bourbon. With single flavors I can "mix up" either in one of my
tanks, if it's a failure, you only lose a few mL. Also you can try weird combinations, (bourbon and waffle is good as a matter of fact)