Ever hear of periods (.) race?
As far as which is better, its just opinion. Choose the bike which fits your needs. Completely ignore the speed issue, im very serious. Since your new, you shouldnt concern yourself with speed
. The R1 would be best at handling. I really cant tell you which is faster at acceleration between the Busa and the ZX-12(I am assuming you mean the 1200R, other than that, the busa is better). When considering power, its hard to tell. The busa is the most stable tho, of any bike i have ever been on.
First thing you should do if your going to get a high performance motorcycle is take a MSF course, I get 10% off my insurance for taking it too. Then just go to dealerships and simply sit on the bikes, find one that is comfortable. For me, the busa fits perfectly. Plus, I like the confortable seat on the busa, The ninja 12R has a really really hard, thin seat.
Pick something you dont expect to get tired of also