I am using three EFs right now- the Haz MuTron III+ I bought around 15 years ago, a Q-Tron+, and a Source Audio BEF (standard, non-Pro). I have also tried the Boss AW-3 on gigs and found it wanting, and a large number of pedals in music stores, including the MXR a few different times. Right now I'm using the Haz for an "up" slow quack, the Q-Tron+ for a "down" quick chirp (with the OC-2 and the SP in its effect loop), and the SA for a slower "down" glurp or with the HH controller for some wobbles. The SA's Phasor settings also sound great triggered and with the HH.
Last weekend I tried out my guitar player's board, and he has a WMD Super Fatman which was really nice, doing a great job on long filter sweeps, but we seemed to be having more trouble getting quicker quacks or chirps out of it. Still a beautiful sounding EF. I am really gassing for 3Leaf audio filters, a Proton to replace my Haz-Tron and a Wonderlove to replace the Q-Tron+, which has a fairly significant signal boost that makes it hard to use with stacked effects.