I was thinking that DElf has low hp as assassin. So I raised one to level 7 and raised a human assassin to level 7.
DElf total gain up to 7 was 69. Following this, 575 hp gains will be till hero. About 22 trains for hp (All stats maxed with eq). 795 possible hp gains till hero.
Human's was 74. Following this rate, 617 hp gains will occur till hero. About 15 trains for hp (All stats maxed with eq). 767 possible hp gains till hero.
I think hp gains is a bit better from 40 to 51, but it shouldn't make much difference.

It seems that dark elf will end with more hp than human. What you think?