I find Revita dries my hair out on it's own. Revita shampoo + Revita.COR I am very happy with. Combined I feel they definitely help to improve the scalp and general appearance of the hair.
Revita contains more active ingredients than Nizoral, and is aimed specifically at hair loss where as Nizoral is just aimed at scalp condition.
Also of note, is that you're only supposed to use Nizoral 2-3 times a week? Where as the information for Revita says you need to use it at least 5 times a week for it to be effective.
I have some RegenePure NT/DR shampoo on order so will see how it compares.