I havent extensively tried either pedal on my rectifier but i use the SD-1 with my stiletto always now, not because the amp doesnt do what i want but because i found a vrey specific tone that the pedal only gives me, but i mean i can push my stiletto into mega super duper retarted saturation with the SD1 if i wanted...
anyway i tired both of them and through a rectifier i prefer the SD1 for pushing it, if you want like another gain stage to add on top so you can set your amp up for vintage rhythm, vintage lead and modern rhythm, modern lead, it works perfectly like that, thats how i used mine if and when i had it hooked up to the recto.