They both run ~10/11 second 1/4 mile, will spin the rear wheel if you open the throttle too much while driving, and will do 160mph, in addition, they don't come with anti-lock brakes like cars do, You actually can get motorcycles that have anti-lock brakes, they do exist, and that was a major selling point for me when i bought my fjr1300, the fjr1300 is similar in performance to a 600cc sport bike, but is much larger and heavier, has more torque in low rpms, and has a much higher price tag, but it comes with ABS
If you feel that you can handle that on two wheels, then I would definitely vote for the fz6 because its comfortable, you will find that most sport bikes have riding positions that are very annoying, and almost unpractical, the fz6 is an exception to this.
You probably wouldn't notice since its your first bike, but if you bought both bikes, you would want to throw the r6 in the garbage out of frustration, and a non willingness ot ride it for longer than 30 minutes.
Personally i wouldn't recommend any of those bikes as a first bike, but i will say that there are people responsible enough to learn to ride on them, and at 32 you may be responsible enough, so im not going to jump down your throat and say you will drop it in a few weeks after buying it, before buying either though, you shoudl consider the fact, that many peopel, drop their bike a few times when they first learn to ride, like during slow speed stu[id mistakes, so if you buy one, dont buy one thats very expensive in case you do drop it.
When i was learnign to ride, i didnt park mine right and it fell onto a curb, and anothe time it fell over when puttign it on a center stand, the engine wasnt even running when they fell. and still I dropped them twice.