Electric or mech fan?

Is there a preferred way for cooling? - electric fan or mechanical? I see pros and cons for both.

I like the idea that with an electric fan I get the full cfm flow even while at idle. However electric is one more this that can break or malfunction.

motor in question is a 572” Hemi with alum block and heads, lots of heat, Very little room between rad and water pump. looking for most robust system possible.

ordered a flex a lite fan a month ago, was supposed to ship yesterday, pushed out another month. Can’t wait for it to show up. What Other mechanical fan mfg are there that people would recommend? Mech or electric?