IMHO, the Tone Wheel organ on the T5 is "pure" sounding, where typical B3's are gritty and have more character. The things most lacking on the T5 are a convincing chorus, distortion and Leslie (both rotating effect and the mid-range resonate sound quality). The T5 does have the effects modules that help with these areas, but they fall short. I have a Ventilator II stereo effect pedal which I use with my Hammond XK3C (purchased from Thomann - best price I could find). When gigging, if I use the Ventilator II with the T5 Tone Wheel organ, it sounds much better and closer to the real thing. I don't know what sound packs you can purchase for the T5 that will get closer to a B3. But if you consider a Ventilator II, you get that great Leslie distortion, the characteristic Leslie resonance in the mid-range, and the Leslie spins-up and spins-down authentically when you activate it. Good luck -- it's the one area of the T5 that on its own, falls short for me. I still gig with my T5 and overall, really like it. But without the Ventilator II, I typically won't use the T5's organ sounds.