45 degree notch trowels in my own opinion are far superior to traditional square notch patterns due to the coverage and bed they give. I also find that troweling is smoother and more flowing with the 45 notches.
Thats not to say square notch trowels dont work, as obivisouly we know they do, its just like comparing a Ferrari with a Ford. both will get you from A to B, but each will do it a bit differently.
I have the raimondi.