I really enjoy harmonic tremolo. To me it’s more interesting/pleasant than regular tremolo, but often phasers and vibes are just a bit too much. The new pedalpcb harmonic tremolo seems like a winner.
There’s lots you can do with the arachnid with eeprom builder. The unison (dual detune) is a great chorus that does the constant pitch shift, like what people use the rainbow machine for but better in my opinion because you get detune up and down at the same time for a deeper effect but still sounds in tune. The kaleidoscope patch (daydream delay) and sample hold filter are really cool. Though tremolos and phaser patches I didn’t like as much as analog versions of those effects.