We have not any method to join the two Cups together to make a "season". There are not rules for it because it never was intended this way. So, a posteriori, I have to use some method.
Points aggregate is not totally ok because: 1) Cups are not equally sized in terms of GPs; 2) Easiest part of the season (that accumulate more points) would tend to be favoured; 3) People who didn't do well in one part perhaps chose to throw it in the last rounds, without knowing there would be a "season total".
So, I prefer medal count, resorting to points aggregate just to decide some untie. I think it is the cleanest way to joint the two different competitions (Summer and Autumn).
In case of any doubt, ask Dani. He is the owner of this game... well, at least he has paid a lot of money for it