What year was it? The 2006 to 2011 models were different from the heavily revised 2012 to present version. In stock form the early version was noted from being tuned for being a bit soft on the low end and only hitting it's stride once into the upper RPM. The '12 and newer are much stronger everywhere.
Someone mentioned the 'Busa. It's arguably the better machine than the '06-'11 version. The '12 and newer ZX-14R has more power then the early version, it and the 'Busa are essentially equal to about 6k RPM, where the ZX-14R power curve pulls away to ultimately an approximate 17 rwhp advantage. The ZX-14R is also smoother than the 'Busa engine, due to it's dual counter balancers, as opposed to the 'Busa's single counter balancer. On the 'Busa that just means some slight vibration felt around 4700 RPM, or 90 mph in top gear.
The '12 and newer ZX-14R has softer suspension, and a more relaxed riding position than the 'Busa, so it's more comfortable for most people just cruising along. The 'Busa with it's more race-rep riding positon, and firmer suspension, is better when riding down a twisty stretch of road.
As far as aftermarket, the 'Busa by far has more support.
So if you want to leave a bike stock or nearly so, the '12 and newer ZX-14R is a great choice. If you want to modify beyond some simple changes, the 'Busa can be turned into whatever you want with aftermarket support. Be it a really fast Sport-tourer, or 600+ rwhp drag bike, or Landspeed Racing bike.
Example of a no-bar drag bike.
Example of a Landspeed Racing 'Busa. Bill later went on to achieve 311.945 mph at Loring, but was killed at a later event. RIP Bill.
Ideally everyone needs real talent and ability to ride a Motorcycle. Even then there's no denying it's still dangerous. If you choose to ride, do all you can to improve your riding ability, and ride what you are comfortable with.