Quote Originally Posted by Hayday91 View Post
You'll want to be comfortable so you enjoy riding more.
With that said though, you'll 'feel' more comfortable on a bike you have your heart set on.
I personally wanted to ride a cbr250rr pretty badly, and I bought one without sitting on anything else.
Also, I'm a little taller and a little lighter and the cbr seems like a nice size.
I sat on a ninja300 and sitting so upright felt awkward. I can only imagine what the wind would be like on a highway.
The new ninja250 you may find a little slow. The 300 is a bit more powerful with more torque than even my cbr, but is ~25kg heavier.
With all of this aside though, just sit on something and take a few for a test ride. If you decide on a bike before you sit on any, you'll be bias.
cbr250rr is more of a sports bike than the ninja250r, i find that i gotta learn forward way more than on my ninja if im on the cbr250rr which to me is very uncomfortable after months of the ninja so yeah if you want comfort/relaxed ride go for the ninja, if you want dat sound/acceleration cbr produces over the ninja then get that