Best ring radiator compression driver?

Has anyone tested what's the difference between e.g. a BMS 4540, Eminence n151m and B&C DE360?
Or how about other small CDs that can play up to 20kHz like the Celestion CDX1-1425 and CDX1-1412?
Which can play the lowest, highest and has the least distortion etc?
My goal is to play at least close to 20kHz flat at up to 125dB/1m, so not that much for a CD and it will go in a constant directivity waveguide.
I have 40-90W per channel and fully parametric DSP to correct the output.

Here are some tests I've found, but they don't use the same waveguides so I don't know how comparable the results are:

n151M test

DE360 test

CDX1-1412 test
 
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