This is a really stupid match-up. How can you determine a victor when we haven't seen a prime hiruzen?
Minato's feats>Hiruzen's feats.
Hiruzen's hype>minato's hype because of what is stated in the manga (most powerful hokage, god of shinobi, professor, greatest kage of his generation, bla bla bla). He also apparently has a counter for every jutsu in konoha, which someone said is written in the databook. Unfortunately, I cannot find hiruzen's databook entry and therefore dont know whether this is true. If it is infact true, then I say hiruzen wins. He probably knows more about minato than minto knows about him and would therefore probably be familier with his techniques, and thus be able to counter them.
Oh well who knows!