Bulls is a US company; Gazelle is from the Netherlands and Gazelle is much older. I believe.
Nevertheless, ride both. The Performance Line CX (Bulls CL Evo) has been getting more tuning support from Bosch than then Performance Line Cruise (G380). This *might* be important to get a smoother acceleration and smoother assist, which might help the stress on your knees. But I am not sure. Riding, accelerating, decelerating, re accelerating might give you better insight into the "smoothness" of the assist. Test this on flats and hills, from a standstill and while moving.
Hope that helps.