It can be determined which is best. You only need a somewhat accurate measure of how many BE players there are and how many people actually want HE as a seperate race.
Aside of course from the fact that somewhere around 80-90% of their population became Blood Elves. A population that wasn't all that big to begin with and hasn't exactly had opportunity to grow since then.
Besides, it was Blizzard that said that HE population is to small for a playable faction. Not us.