Having a quick internet earch throws up a lot of discussions on what people perceive to be the "best" Warpriest blessings but, they all fail in one major aspect. Blessings are not a singular thing, you have to select two that your deity has.
Now I have not gone through every combination but I would guess that there are one or two combinations for which there is no deity for
So I am asking you, what do you think the best two Warpriest blessings are in unison?
I will start
Protection & Luck (Bes is one deity for that combination)
They both achieve the same thing, making you more sustainable but, by going about it in different ways means they can stack or, you can pick the right one for the occasion
Probably more useful to have two which do different things, which you use in different situations - good for a combat buff and summon meatshield later, luck for a more general buff and a quick debuff to the enemy from L10.