The best I’ve owned:
Friedman BE-100, like Fret Shredder mentioned. Mine is ‘18, 4 switch. Ooh La La.
Splawn Quick Rod. Had a bunch. All great. I think I liked the 3-pre version the most, but I wouldn’t get hung up on the differences.
Cameron Aldrich mod. Great sounding and fun to play, but not remotely worth the prices they command.
If you’re cool with rack gear, I’d recommend a Rivera TBR-1SL. Maybe the best channel switcher (British crunch, American cleans) ever.
Sleeper of the bunch is a Top Hat Emplexador. Goes from JTM45 to 2204 tones. Not high gain, but hit it with a TS-9 or an SD-1 and you’re in business. Only amp I ever owned that just begged for Slayer riffs. Go figure.