Comparing the B12 to the FZ1 isnt really a straight comparison. Compare it the the B1250 and you find the FZ1 lacking in several areas Including power.
http://www.motorcycle-usa.com/Article_Page.aspx?ArticleID=3132Several changes have been made to offer greater drivability. The Fizzer's crankshaft has been given a 33% increase in weight for better tractability, and Yamaha's EXUP exhaust valve boosts low-end snap. The result is a claimed
148 crankshaft horsepower, seven up on the old bike and perhaps a bit more than
130 horses at the wheel. Despite the midrange-biased cams, peak torque is said to only match the R1's (and the '05 FZ1) but it arrives at 8000 rpm, 2500 rpm sooner.
http://www.wheels.ca/article/263202007 Suzuki Bandit 1250
The engine is a huge improvement and, even though claimed horsepower remains at
96 hp, that number kicks in 1000 r.p.m. lower, at 7500. The most noticeable change in El Bandito's personality is the torque; up almost 20 per cent to 79 lb.-ft., and it arrives at 3500 r.p.m. rather than 6500.
I still would choose the B1250 over the FZ1