I've used newer morleys, Dunlop 105q, 535, as well as gcb 100, and many more.
The single wah I keep returning to us my ibanez weeping demon. It can get really 'cliffy' and gets used in plenty of environments.
Unfortunately they don't seem to be making them anymore
Though on the plus side I have two
I hoping to find a bass chi wah wah to try though.