It would be interesting to compare the t/o and landing perf of the G550 and Global. The Global has slats whereas the G550 doesn't. Now I'am wondering if these slats could gives better performances on the Global in order to land on European's shortests runways (Samedan, Cannes, St Gallen Altenrein, etc..) whereas in the USA most of runway strips are long enough to be operated by any kind of plane. This would explain the Bombardier's success in Europe against Gulfstream.
Take that as a simple question, not a trigger pulled on Ppruners to get "what is best".