What is Mick's favorite blood type?

I've always wondered if various blood types (A +, O -) taste different to Vampires. We know that Mick can discover things about the people he is tracking just by smelling blood evidence. In this fun, brief excerpt from one of Alex O'Loughlin's interviews, he good naturedly talks about his favorite flavor. Is it A negative? O positive? AB positive? I know a lotta people who would like to help Mr St John with his taste test!