Alot of people around here like the X1060 better than the Diablo because the controls are a little smoother. I tried the X right before the Diablo came out and ended up getting the Diablo. By my understanding the Diablo has bigger pumps and wheel motors and a little more ground speed. I'm not one of those that worry about ground speed cause I don;t have any account where I can go the advertised 14mph lol. And its my opinion and I'm sure there are people who will disagree but I don't think any mower regardless of Brand cuts GREAT running wide open.