The best bless, of course, is A10E10F10W10S10D10N10B10. For some reason there is no pretender that would allow for this combination.
On realistic games, I might take e.g. Fire 9 Air 6 Phoenix for Man, Tuatha, Vanheim etc, or W9E4 if I wanted to have fun with Claymen.
"Best" is relative, though. The one I used in my thus far only DomII multiplayer game was Water 9 Son of Niefel, with Utgård theme. The blessing itself wouldn't have been worth it, I'm not sure if I recruited a single Woodsman in the whole game. However, it made every Jotun Herse a force to be feared. My Seithokna researched Evocation at top speed, and I was able to start using Falling Frost surprisingly soon. Quick drop to Alteration two doupled the mayhem, and Sudenhuuto amassed hundreds of kills in few turns. My Seithokna researched continuously until Evocation 7, at which point I could have transformed my army of resesarchers into army of Eagle-Eyed Nether Darters.