FL610
One's better than the other....how can you compare two such different aeroplanes? they do different things. If I want to fly further I'll use a GV but I'll need a longish runway, if I want to go a long way out of a short runway (or into one) I'll use a 7X. You're viewpoint seems a bit simplistic.....
...or when you say Gulstream are you refering to the company. In which case you may have a point.