Will probably never take it to the insane level. Not doing the Stoner/Doom thing. More of the Nirvana/Tool/AIC thing. Never had a Rat before so I'm a little in the dark.
Just needs to take active basses well. Low end loss is certainly a pet peeve of mine as well.
Ive tried quite a few rat pedals now that I think about it
Blower Box
Rat tail
Rat king
Peavey Hotfoot
Proco Rat
Volt thrower
Vick Audio rat
Abominable DTOM
Proco SOLO
MXR Bass Dist
There are a few I still really need to try like the NYC wood cutter and the Dunno grand deceiver. I REALLY want to try the Dunno, that thing sounds like it is a total bad a$$.
I have always REALLY liked my Blower box. The BB is the one dirt pedal that has stayed on my board since the first day I got it. Some say its not very ratty, I dont agree. It's very rat like to me. Its got the LM308 in it and it sags and raunches like a rat. And oh that sweet low end!! Its so fat and juicy. It can do OD to almost fuzz. Awesome choice IMO. The active EQ is really strong and it receives active basses wonderfully.
Just about all the rats I've tried accept active basses very well just an FYI
I liked the Volt thrower but it didnt really agree with my ear. Wouldnt have been my first choice, but I cant form a good opinion on it as I only spent maybe 20 min with it and that was with someone elses rig.
The Fuzzro Rat tail just rules (these are now called CAT Tail or CAT King. He had to change the name so he didnt get sued)!!! I actually have a RT w/ 2nd dist mod and a blower box on my board. They both sound different enough for me to keep both. The RT straight rips. It's easily the raunchiest most guttural ripping dirt box on my board (EDIT: actually the B:ASSMASTER is. But thats a fuzz

). The blower box (BB) is a little smoother. And many complain about it being too scooped, which is somewhat true depending where you set your EQ. But overall, it works well in a mix IME. And it is just mean and saggy and awesome. I think it's one of the most unique rats/dirt pedals around. Matt really designed a classic when he built it IMO. And good God that RT is the bomb though. At loud volumes it's absolutely lovely. I used to have a Rat King and I really didnt think it was all that but that was over 4 years ago and I have learned A TON about dirt since then. So if I had it again today, I may feel differently. But the RT and BB would be my first choice. I actually used the RT a lot on our new EP we just dropped today. It's all over that record. It just does what it does very well. The clipping options on it are the bees knees too, really allows for a poop ton of tones.
The Peavey is great. Low end loss though. That sucks because it could be a real contender. Maybe with a blender....
The Proco and the Vick, again, low end loss. Otherwise great rats. The DTOM was really nice, but I remember struggling with it in the mix. Same with the MXR. They both sounded great, but in my bands mix they were getting lost and I couldnt dial in a sound that didnt get lost. But that again is MY bands mix. My band is a hard rock original that is akin to Tool, Incubus, QOTSA, stuff like that.