Poured concrete vs concrete filled block for below grade foundation walls

In searching the web, it seems everybody compares hollow concrete block to poured concrete. I do get that poured concrete is the safest way to go. I am curious if there is any data comparing concrete block filled with concrete/rebar to poured concrete. It stands to reason that the concrete-filled block wouldn’t have that much less lateral strength or less waterproofing as compared to poured concrete. I’m tempted to take the risk at half the price. Anyone have any solid data on this?