So I know this is a biased environment, but what bike is faster out of the three? The GSXR is close in top speed. What about low end (0-100 mph)? The V-twin TL produces a lot of low end torque. Fastest off the line? Let the debate begin...
The only bike that gives a Busa a run for the money is the ZX12. I ride with a 02 ZX and we have the same mods and geared about the same and it is very close. Before I had the Busa I owned a GSXR 1000 and the ZX12 made me decide to trade it in for a Busa. I was tired of getting beat on roll-ons and with my size the Gixxer just didn't have enough hp. A small guy on a Gixxer with all the right mods would be a little scary, but at this point I have not found that combo to ride against!!
Based on personal experience, the GSXR1K is close to the Busa in straight-line performance. It doesn't, however, have as much low-to-mid rpm torque as the Busa.
The TL-R? Not that close...I can pull on a TL-R at will, unless the TL-R has been extensively modified. Most stock TL-Rs make about 125-130 RWHP, and the Busa about 150-155. Based on published dry weights and HP numbers, the Busa makes about 0.32 HP for every pound of weight, and the TL-R about 0.30. The TL-R also has a higher center-of-gravity, great for wheelie-ing, but less helpful for acceleration.
If your primary concern were off-the-line performance, then the Busa, 1K and ZX-12R would be the top choices.
in a straight line 1/4 mile...GSX1k wins...look at any #'s in a Motorcyclist mag, however, the busa I can ride all day. however a slightly modified busa will certainly keep up with it. Roll ons and torque...the busa wins!! All hail the busa!!!!