Busa vs XR.
Busa is heavier as XR and you can feel it all the time. High, low speed, in the traffic jam, short corners, but Busa is more stable especially above 200 km/h.
The acceleration, hmm I think that up to ca. 200km/h is comparable in daily use. Busa has practically no vibration from the engine, XR - hmm everybody knows :).
And for me the most important - breaks. Busa has no breaks. :)
regards,