I’m a low to medium gain guy, and have been having great luck with a Pettyjohn Pettydrive 2 with the pickups as well as my amps. I like that I can dial it in very subtly and use it just to add character to a track I’m working on, or dial up a little more grit when needed.
It uses different diodes for different modes, and it’s actually two pedals in one, with three diode options for each side of the pedal, so there are 6 choices before you even start tweaking. The onboard EQ per side of the pedal is very nice. There’s also an alternate transistor included in an unconnected socket on the circuit board that you can swap in for a different overall sound.
But I suspect that most here want a little something more gainy out of their dirt pedals, so I should also say that the PD2 will do that, as will pedals like the Xotic BB and OCD, depending of course on the amp (pedals need to be right for the amps, too).
Here’s a pretty thorough demo of it: