If your goal is purely to cut, and increase endurance SR9009 and GW501516 is going to offer more of that.
The MK2866 and Cardarine will offer some increased strength, and healing benefits(Joints, bones, etc.), as well as allow for a faster recovery between sets, and a greater volume in your training time. I really like the healing side of MK2866, and would likely start with MK2866/Cardarine as my first SARMS Stack... "but that is like, totally my opinion man."
With that said, your diet, and training need to be on point to get the results. PED, etc are only the Cherry on top, not the Ice Cream and Brownie base of your sundae.