Higher FB dmg at full health i agree, however ... 800-820 HP - FB will do 40 points of damage. 821-825 HP - FB will do 41 points of damage. So we are talking 1pt more dmg per FB, however a dragon with max str deals more damage. a dragon with 825 STR gets a 165% bonus to damage. a dragon with 820 STR gets a 164% bonus to damage. (I'm not sure what 815 would get as a bonus) This info is from Dalavar and Taliic, stole this from their posts.
STR is def greater than HPS. But I highly doubt any of it really matters at those levels. It's all about OCD and having a clean dragon. Since this one has a nice clean number of 815 vs 817 or 819 etc, I like it better. I have extreme OCD like that to where numbers have to be rounded off etc. So to me, this is a nice and clean dragon : ) haha