All 600's are slightly, slightly different. You might not be able to tell right away since this would be your first 600, but if you've owned a 600 for a while then it's pretty easy to tell. I used to have a '14 CBR600RR and really loved the bike. It's not really 'great' at anything, but it's well balanced and good at everything. If you're a short person then I'd probably look at the gixxers since they have the lowest seat height.
The R6 has a very aggressive riding position that you may find heavy on the wrist for any distance riding. It is something you get used to though as you learn to support your upper torso using your knees against the fuel tank.
The Triumph Daytona 675 always does really well in group test against the 600RR, R6 and GSXR's.
I am amazed how many times Kawasaki's are mentioned. I don't see them so regularly where i live. But anyways, all of the Japanese 600cc are a solid start, but you might also want to look into Ducati, if you care for V2's.
Also depends on your height imho, i would recommend you test drive at least all of the Japanese bikes to get a feeling for how the seating position is. There are large differences between the manufacturers.
I originally wanted to buy a Fireblade, but the seating position was not right for me. I never thought about bying a Ninja, but when i test drove i just felt at home.
TLDR: Go test drive and find the bike that suits you
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