B7K, even though I *dont* use it as an overdrive, but it makes everything I run into it sound so much better!!
Still have my old DOD bass overdrive, but it needs to be repaired as its acting very strange right now...
On my board are both the V2 Swell Bpro and the bk butler "Real Tube Overdrive", both are amazing sounding pedals, before this I had the fulltone bassdrive and it was cool, but I found the 2nd channel useless for my needs, but I still have the OCD (v3!!)...
The digitech/hardwire"tube overdrive" and "valve distortion" are both still amazing to me, and both *can* be voiced similarly so they are good to stack.
I also had the Swell Bpeg, a V3 bpro, fuzzrocious rat tail, the BDPG, but I found a real winner with the SA OFD, its just amazing, and I'm pretty sure it'll be my go to dirt, the tube settings are wonderful,nice and touch responsive and not "digital" sounding in the slightest, I still wanna try the DG VMT though, or even the VMTD as an always on grit, since I built my fEARful cab I've had to really dial back the clank in my tone, and I wonder if the VMTD would better suite my needs....
Finding the right Overdrive is a deep, deep rabbit hole of $$$, I also briefly owned the empress multidrive, I could've saved alot of money and time if I just got the OFD in the first place, but then again I can now make a slightly better decision based on the few I tried, good luck!!