Hello,
I just stumbled on this : https://www.youtube.com/watch?v=3-P3Ile4dfA
Jacques, from the french pedal brand "Jacques" started a new show on youtube where he plugs several overdrive pedals into an osciloscope to compare waveforms.
I thought maybe you'll find it interesting.
I think there's going to be a lot of shows since the guy has an enormous pedal collection (as he said in a documentary : almost every pedals ever made)