This is sure to be controversial, but I can’t argue with their thoroughness. 

Acid Voice has compared a collection of the top clones of the Roland TB-303 and ranked them, based on how well they clone the sound of the original acid synth. 

They’ve got audio demos and in depth comparisons of the various bassline synths, including the x0xb0x, the Future Retro Revolution, the TeeBee and the FR 777. 

Here’s how they stack up, in Acid Voice’s opinion:

1. Adafruit x0xb0x
2. Future Retro Revolution
3. Syntecno TeeBee MKIII
4. Oakley TM3030
5. Analogue Solutions TB-X
6. Acidcode ML303
7. Acidlab Bassline 
8. MAM MB33 MKII
9. Future Retro 777

I would rank the 777 much higher. The Future Retro 777 will do just about everything you’d want to do with a TB303, plus it’s a fairly full-featured analog synthesizer, too.

The bottom line, though, is that there’s never been a better time for people interested in great-sounding acid bassline synths. 

Let me know what you think of the results!