I've rented both the sd64 and an 82' working height ommelift. They are similar in weight at around 8,500 lbs, but the ommelift can fit on one sheet of plywood lengthwise which will be a big time saver with loading and unloading 1/2 the plywood every time. The tracks do leave marks in even hard lawns because they are so short and narrow so you will usually have to bring plywood no matter what.
It'll all come down to your market and how many gates/tight areas you actually need to get through. I believe the ommelift tracks move in to around 36"-40" wide. I do enjoy the sturdy feeling of the sd64 and sp64 though. But after you work with a spider lift type boom a few times you get used to it.