I have knee issues. I've tried them all. The GR line is simply the best. 3's were good. I did not mind the 4's. The 5's are just as good as the 3's were with a bit more firmness.
The Nike's did not cushion as well and the fit just never worked for me. the toebox was too small.
The New Balance were an utter nightmare. The cushioning sent pains through my knees ever step after an hour on the court. They were the only shoes I ever threw away after first use.