Pally: Blast vs Divine charge?

Previously it was equivalent to level 11 in the other charges (so 43% - the other charges start at 13% and go +3% per level to 100%) but since BB, elemental charges always have 100% advantage at any level.

so then the only difference between lvl 1 and 20 is duration and damage, but not element advantage? lovely. Guess i'll stick with getting guardian for now provided i can find a guardian 20 skillbook that works (ive failed 2 so far..). Unless achilles / powerstance are more justifiable but i doubt that. thanks stereo.