Honestly, there's SO much variety out there and when you accont for how different basses could sound through a given pedal and how they fit into your band's overall sound, it's an almost impossible question to answer. I have three ODs on my board now, another seven that I like too much to consider selling even though I'm not using them at the moment, plus I don't know how many more I've sold in the last couple of years.
Ignoring that reality

,I think my favorite overall is the Blueberry circuit. I have a Bearfoot FX Queen Bee, a One Control Blackberry, and a Bearfoot FX Blueberry. The added capabilities of the Queen Bee and the Blackberry are pretty cool, but my preference out of those is still the Blueberry. It works well with all of my basses with minimal tweaking, it does an outstanding low to lower-middle gain OD, and the interaction of the Gain knob with the "Nature" control (a tilt EQ) give it a lot of flexibiilty.
That being said, none of them are on my board right now. Lately I've been enjoying my Spaceman Effects Saturn VI as my always-on, standard low OD tone. I then use a Broughton SV-Pre to give me a little more dirt with a little brighter tone and a Broughton FlipTop for a little more dirt with a little darker tone. I think those three also do a really nice ODand are great choices.
My Blueberry was previously in the role that my FlipTop is currently serving, but I bought the FlipTop most recently and just started gigging since New Year's Eve, when we played our first gig since coming out of the pandemic. So I've been enjoying my new toy for a while before deciding whether to continue with it or put the Blueberry back on my board, or perhaps do something different and unexpected after a while. I've been intrigued by all the great reviews I've seen of the Damnation Audio MDB-2 here on TB, so maybe I'll give one a try.
Bottom line ... there are so many choices that the only way to figure out what you like and don't like is to do some research to try to understand some basic flavors of the ODs that are out there and then just start trying some. But watch out. It's easy to fall deep into that rabbit hole!
