I'm a sucker for the ehx big muff, specifically the big box version. I have a fairly current NYC reissue modded to my liking but over the years I've had several NYC reissues, black sovteks (they used to be cheap and plentiful), even an original op amp version.
ye olde sd-1 because they're cheap as chips, easy to mod, and easy to replace when you get tired of it, sell it, then decide you need that cheap one on marketplace
which brings us to the rat. I don't really like it enough as a pedal to justify the amount of times I've bought one, eventually modded it, then sold it to someone more enthusiastic about it than I am ... then did the same thing over again. the cost of the chips finally got me to stop but I do have a rat 2 with the proper chip and tone cap I keep mostly as a reference pedal