Racial spell comparisons

HI, can some one please explain to me the difference (because i se them as the same) between Undead´s "Touch of the Grave" and Zanadalari Trolls "Embrace of Bwonsamdi" (at least up to the current Patch version), and wich one it´s better ?

The same question, about wich one its better goes for Undead`s "Cannibalize" and Zandalari´s "Regeneratin´" ?

Oh, and also, how good it`s (from 1 to 10) the "normal" Trolls "Regeneration" ability during combat ?? —The preceding unsigned comment was added by Honujabo (talk · contr).