nomorecatering:-
I should imagine that Gulfstream will try very hard to stick with the "simple" wing design i.e. without the use of moveable leading edge devices. In their sales campaigns, they have always maintained the "simple versus complex" is best approach. This aspect of the Bombardier product, which Gulfstream assert has a more mechanically complex wing system, is regarded by them as a poor selling point from the maintenance cost aspect of the operation of the aircraft. I leave it to you to judge what is best from a landing performance / approach speed perspective.