What leader works best for each type of Lychguard?

Im playing a game with a friend on Tuesday and bringing two units of lychguard, one with swords and shields and one with scythes. I have Imotekh and an Overlord with Translocation Shroud to lead them, but I'm not sure which leader would be better with which unit of Lychguard. (I'm using the obesance phalanx detachment and the Overlord with Translocation shroud has the Unflinching Will enhancement if that at all affects the decision)