Best Blood Unit

[NTJedi]

Truper said:
It depends of course on who I am and what I want my demons to accomplish. Nations that can summon Storm Demons are not likely to be able to summon Bone Fiends, and vice-versa. And also, Devils are likely to perform better for Abysia than would Ice Demons, even if they had the means to summon any, while the opposite might be true for Jotunheim. In other words, I don't think asking which is better without any context makes sense - they all have their uses.

Assuming you don't know what you're starting race will be and you know you have a choice to start with any of these... which would you choose.
Imagine if someone was hosting a game and the host was not playing in the game. The host then said he would randomly choose a map each week and those participating would be randomly selected a nation yet first they had to purchase blood units from 40 blood slaves. Based on the cost of the spells for an individual blood unit the host would start the players with their selection(s).

Each nation would also start the game with 3 Bane Lords for the assistance in moving/commanding of these units.