See... here's where I'm not going to agree with Steve. And no offense. Sincerely...
I have tried the EMG BQC in a couple of basses and it seems to not have the growl or bark that I like.
In probably what comes down to a playing or music genre difference between us, I find that the TP when tamed with the volume output trim pot is a very aggressive, yet flexible circuit.
Outside of the OBP-3, which when I spoke with Dave Boonshoft, owner of Aguilar about it, come to find out it's a mixture of the warm, analog tone that you get with OpAmps and it has the clean and articulate JFET circuit, both running inside the same pre-amp.
I really was impressed with how close the OBP-2 @ 18v sounds to the Spector USA 18v circuit.
And of course the USA 9v circuit is that growly, gritty gold standard.
For myself, and honestly you're in a tough place because you're not really going to know what a circuit is going to sound like in your bass until you put it there, the Smadder setup isn't really an option I'd ever go for. Even in the Alex Webster I had, which sincerely I really didn't play because I'm not a 5-string guy, I find it much easier to dial in the tone I'm looking for with the OBP-3. And most of the time I've been playing USA Bolt-Ons and they're setup for 9v.
Run the OBP-3 at 18v and you'll have headroom, warmth, articulation and the ability to overdrive it with clarity.
My $$$ would be on the OBP-3 @ 18v if you don't want to go for the USA 9v or USA 18v Spector circuits.