I chose LeFleur just because he's the more exciting on the face of it (Offensive, Rams, McVay offense, knows division), but I suspect Campanile might end up being the better.
Watched several LeFleur interviews now and he doesn't scream "Leader of men". In his one outing as a play caller he failed (albeit with a bad roster). There's no league buzz (that I have seen) about how players love working with him or will run through walls for him etc etc. He seems a well respected passing game coordinator/assistant, which is what he essentially is for the Rams despite his title.
Campanile on the other hand is less attractive on paper but I've read plenty of buzz that his players love him. Apparently a great leader. Who may actually be better suited to being HC. But if it's Campanile we likely get Shane Waldron, Darrell Bevell, Frank Smith or Spencer Whipple as OC, and I don't particularly like any.
I suspect LeFleur could put together a better staff than Campanile.