If we're discussing field performance, a big issue will be what drives your field numbers. Are you Vmu-driven, in which case, unless your geometry is truly odd, you're likely limited to, say, 15 degrees pitch. So anything that affects in-ground-effect lift at, say, 20 degrees and above only is useless.
Whereas you may be stall-speed limited - in which case anything that improves CLmax is good (provided the lift is usable of course).