EHX Q-Tron+. I like drippy funk envelopes, but that pedal's settings all sat right in between the settings I was hearing in my head, and never quite did the thing I needed as a result.
With even just one more parameter control, the DigiTech Bass Synth Wah would be a lifelong winner for me, but again, it could only get about 80% to what I needed. They're certainly fun, though.
And ultimately, after working with it for years, I decided I'd never really been 100% happy with my Swollen Pickle's layout. Sounded phenomenal, but it literally stressed me worrying about if a tiny knob nudge would make it destroy my amp, or suddenly go from a bear's intestinal rumble to a hive of bees on an LSD-infused dandelion trip. But I couldn't just pop off the knobs since it interacted with other pedals enough to need occasional tweaks.
There's more but I wanna give someone else a chance