What deity? Are you going standard warpriest or Sacred Fist? Usually, warpriests work best when you focus on a single weapon that your feats improve. Since you get to choose whatever weapon you want, you can choose one that Tengu gives you proficiency in, that a warpriest's martial weapon proficiency wouldn't normally give you. For example, a falcata is a very strong weapon that a warpriest doesn't normally get, as I'm pretty sure there are no deities with a favored weapon of Falcata. You can also get an Estoc, a Khopesh, a Rhoka, a Wakizashi, a Katana, a Bastard Sword, a Seven-branched Sword, or other exotic weapons without having to choose a deity that has that as its favored weapon.
Also, you do not get any domains as a warpriest. You get blessings, but the blessings do not give you spells.
