Used both systems and personally prefer QFE but no one really worries about my opinion anyway.
One point though cloud base is given relative to the airfield so when calculating alternate requirements etc you've still got to do some mental gymnastics adding this and subtracting that etc. ..... and the approach plates print both heights for minima's anyway!
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QFF is the setting on the sub scale that gives the same reading as a known datum eg. Rad alt reading or A'field reference points.