Had and flipped the Barbershop, Grizzly, and Beta (jfet/germ). Have the Phat Phuk B, Aggie THDI, and Lehle/Basswitch Sonic Spark.
I always want in depth personal reviews when I'm looking at dirt pedals - here's my contribution to the mess of info scattered around this board.
Beta is cool in the videos, but the low end boost on the model I had (cream/red) was pretty intense. It's baked in, so there's no way to really avoid it. I dig it for the motown vibe, but it was not my cup of tea for always-on grit.
Barbershop and Grizzly are definitely touch sensitive. I played both with active and passive basses (active jazz, passive jazz, passive P), and felt that the Grizzly could take the heat from my active bass where the BShop didn't deal quite as well. I think the barbershop sounds sweet, but it did get a little honky/kazoo-ish digging in on my active jazz, and that was without boosting any lows/mids on my jazz. I flipped it because of that,
and I felt that it slightly compressed/rolled off some of the lower lows in an undesirable way. Perhaps nothing you would miss (may even welcome it) depending on the sound you're going for, but I definitely noticed it. My hope was for an OD/tube simulator to add harmonics and a bit of thickness or fatness. I thought the barbershop was almost too transparent in that it didn't thicken the way I like. YMMV...
Grizzly was more diverse in the amount and type of grit I could dial in, handled actives like a champ, and the funkulator & hi-cut knobs are cool - if you intend to use them. However, it sounds like you don't want any mid-scooping or major tonal changes, so the bottom two knobs may be unnecessary. I honestly flipped the grizzly because it wasn't doing
enough to my tone, given how I was using it. This is just my opinion, but the grizzly simply sounded like a bit of hair or grit "on top" of my standard bass signal, since I was just using a hint of the mid scoop and hi-cut. I don't like rolling off too much high end, and thought the scoop sounded better with slap than fingerstyle. It's a great pedal, but I wanted a bit more character and more of that tubey fatness.
Wren & Cuff PPB - Maybe not top of your list, but this definitely has that magic something. First off - there is only one real demo (from WrenAndCuff) on youtube, and it sounds like he's pushing a tube amp with it. I don't think it's a good representation of what it can do on the more subtle end of the spectrum with a solid state amp. It adds some presence and girth to the entire range of your bass - a little sparkle in the highs, some harmonic thickening across the mids, and some fatness/punch in the lows. The internal trim pot allows you to tweak the way it responds, and the germanium transistor definitely has a sweet spot to it. The way mine is set, I get a tiny bit of breakup if I really dig in on the E string in the first position. Otherwise, it's more sparkly fattening, rather than breakup or distortion - it just makes my bass sound 'bigger' when kicked on (or kept on as it were).
Tons has been written on the Aggie THDI. I love this pedal for grit and tube-emulation. It can run clean, but I think the AGS is where it shines. Using standard EQ settings and super low gain with the AGS, I've been able to dial in some fairly transparent hair/grunt with just a touch of roll-off in the highs. The real revelation was reading
this post and trying his last suggested setting ("Here's another trick..."). The THDi is not the most transparent pedal out there by any means, but I really dig the character it imparts. I think everyone hears and describes their ideal "tube tone" a bit differently, and the TH gets close to what I'm looking for. Bonus: I won't claim it sounds the same, but this pedal does a solid impression of a DB751 (minus the 750 watts of MOSFET power kicking you in the chest).
Lehle Basswitch Sonic Spark. Worth a mention if you want lots of harmonic 'richness', added punch, and don't need anything significant in terms of distortion. Ed Friedland has a
great demo on it - I will say that even with headphones, the video doesn't fully display the sparkle and fatness you get from it in person. The lower Intensity/EQ knobs can do a lot on their own and have a pretty wide range. If you keep things on the deeper side and don't go crazy with the intensity, you can then use the enhance to bump up the amount of harmonic content and dial in your desired amount of punch/presence. It can get a little bright if you crank the "enhance" and/or roll the 'eq' knob toward "bright", but it's manageable by rolling off the treble/tone control on either your bass or amp.
Have fun...