In my experience, a hybrid splitter/combiner shifts the phase by 180 but keeps the amplitudes fairly closely matched (assuming it's being used at the correct frequency); whereas a directional coupler generally has one output a fixed number of dB lower than the other -- plus some will have another output near the input which willl yield the return loss number, referenced to the output tap. I used dierectional couplers to tap off to a spectrum analyzer through yet more padding. Also, there is minimal power loss through the directional coupler, relative to the splitter/combiner.
Hence, if you want to power divide, you should use a splitter such as the Wilkinson Hybrid splitter/combiner, but remember that you are going to get a phase shift. Therefore, to repair the phase you are going to need to, I guess, adjust your line length. Or, perhaps, you could send one output into a pad and the other into another hybrid splitter with a dummy load, in order to correct the phase and maintain matched power levels.
Bear in mind though that I am no RF engineer ;-)