Only way to tell which bike fits you better is sit on them and try riding them both if you can. The Ninja 250r is a great beginner bike and even popular among seasoned riders who own it or try it out due to the fact that even though it is only a 250, it has a respectable amount of power. With an experienced rider, it can reach 0-100 km/h in slightly under 6 seconds. That's faster than most cars you see on the road. It can also reach highway speeds of up to 140-150 km/h quite well. At the same time, it doesn't have an insane amount of torque and power so that if a beginner accidentally rips it on the throttle, it's not as likely going to fly out from between your legs like a rocket compared to bigger and more powerful sport bikes. It also has good handling around curves and is forgiving to a beginner.
I'm a beginner rider myself and bought a Ninja 250r for the above reasons and am having great fun on it. Insurance is not bad but not great. The fact that I am a beginner with no previous riding experience and that it is classified as a sport bike are negatives. On the plus side, it is only a 250 so that helps to balance out the cost. If you do a motorcycle riding course and obtain the CSC certificate, some insurance companies may give you a better rate. I did a lot of research before settling on a 250r and never really found any major negative comments about it other then from some taller riders who felt too cramped on the bike. If you do buy a 250r either new or used and decide to upgrade in a season or two, the good thing is that these bikes hold their value really well and are always in demand. I don't have any knowledge or experience on the GS500 but I'm sure it's a great bike too.
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