Just a bit of fun to satisfy my curiosity, and only a bedroom test, so hardly conclusive.
However I was surprised by the results.
I looped an 8 bar phrase, and set each pedal to what I thought showed it to its best advantage. Then switched back and forth between pedals. I whittled the Zoom MS60B down to its best 4 choruses then treated each as an individual pedal.
And the Bass Chorus on the Zoom was, simply, the richest, warmest, chorusiest of them all.
Second place the Joyo, and then the CE-Cho5 again on the Zoom, followed by the Ampeg. The rest were much if a muchness. Except for the Fender Bubbler which appears to be broken .
So a win for Zoom.