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Thank you all for your posts.
It looks like then that the rms wavefront error gives a much more accurate and realistic indication of the optical quality that PV. I found a few academic articles about Strehl, and all used rms wavefront error for Strehl calculation.
To conclude, I will quote Peter Ceravolo: In the past, I, like most amateur astronomers, only considered the PV wave value when assessing a telescope's optical quality. But after observing with a 1/2 wave PV MaksutovNewtonian telescope that passed the star test and yielded excellent images of Saturn and double stars, I felt compelled to reconsider how I evaluated optical quality.
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