When I was first looking I had no idea what type of bike I wanted. It came down the the Vulcan 500 (cruiser) and Ninja 250 (sportbike) but somehow I ended up with a 3 wheel scooter. And now I want a Dual Sport. Short answer is don’t sweat it. You will find out in time what type is for you. Either bike will be a fine first bike. As Much said, take a training class, go sit on a few and gradually you will know.