Tsubaki does have the advantage of speed over Ragna, so even though she lacks things such as priority, range and damage when compared to Ragna, she may have better potential to get in and throw out combos quicker if used properly. Again this is early in the span of CS, and since Ragna hasn't changed too much since CT, it may currently seem like he is significantly better than Tsubaki as of now, but it is best to wait and see what people start to figure out with Tsubaki before we can accurately compare them.