The odb-3 sounds crap if you don't have an amp with a tweeter speaker! But if you do nothing beats its bottom end high distortion sound!
I've tried many bootique and other distortion and overdrive pedals the previous 3 months (ebs, t-rex, fulltone, sansamp, ibanez) and I've ended up on keeping the ebs multidrive for mellow and low gain tube like overdrive (AMAZING pedal for the job) and the boss odb-3 for heavy distortion sounds(Muse like, or Around the World like) because no pedal from the above list can go there! It also depends on what kind of bass you play! I only like the sound of the odb with my stingray! When I play with my Jazz and Rick I prefer the EBS due to the different gain and sound of the single coils!
But as tayste pointed out it really is up to the amp you use! I play with a gallien krueger 400rb and 2 mesa boogie cabs! But when I connect my pedalboard to my little Roland Cube 30 at home on low volumes you can't really tell the difference!