question about blood on TVD

Mikael didnt want to drink human blood, so he only drank vampire blood. And he was so strong, because he was one of the originals and he was very old. I think that human blood is just better, that's why other vampires dont drink vampire blood. And also if maybe damon ou stefan ou anyone who is a vampire drinks another vampire's blood, then after the other vampire would want to kill the vampire who drank blood from him. i mean after all i dodnt think that any vampire would like to be drunk blood from. I hope that toi understood everyhing i sayd, and sorry about my english :)

Meybe human blood tasts better and Michael was alive for who knows how long and he was the strongers judging from his years.
Meybe vampire blood doesn't make them stronger, but just just feeds them.
I seriously don't know, but it is an exelent question :-p