I use every inch of the blades in some form or another. So my knee jerk reaction would be to say 'Yes'.
However, on a SCUT or CUT, they might actually be a hindrance. I have a 100hp tractor, so I've been able to take advantage of the size of the blades. I can't really believe you would ever 'replace' a blade as they are huge, thick, and buttressed. I think the weak point in the chain will be the FEL every time, hence the 'however'.
Having never seen the Notch, other than on this thread, I cannot discuss its merits. But if you have a larger tractor or especially if you have a CTL, I would certainly look carefully at the Intimidator/Notch size variance. I dig with it when the trees can't be pushed over initially. I have only ran into 1 tree that I couldn't get out of the ground, and it was an 18" Oak. I pushed it over, but couldn't get the roots out of the ground. As you can see in my pics, the size of what you can remove can use the entire size of the blades. So, for my purposes, I needed and had the ability, to use the large size.
However, if you have a smaller tractor, the FEL might not have the breakout power to lift something that would require those larger blades, so they would go unused and all you would have is a heavier puller trying to level your back wheels off the ground.
I don't know how 'tooth size' would relate to utility. I know that I like the short sharp teeth, in that they dig in and grab rather than cut smaller trees. (you can cut them, but if you are gentle, you get the feel and can 'grasp' them and pull out 1/2" stuff if you go slowly.) The ONLY issue I have with the Intimidator is at the very end, there is a large tab on one blade which inserts into a slot on the other blade, to keep the blades from torquing and twisting when digging. This is a VERY good thing, however, the design flaw is that the slot becomes compacted with dirt and debris and keeps the blades from closing completely. It is a non-issue on anything larger than 1", however, sometimes I will 'slip' off small things, and have to check, and sure enough, the blades are not touching when fully closed. This is because the tab has compacted the slot and halts the closure. I have a small prytool with which I clean out the slot, and we are back in business. Its not much of an issue, but it is easily fixed with a design change. I contacted Danuser, and they said they had a new design they were testing. If you purchase one, I would insist on the new design. Its not in a 'strength critical' location, and just needs a clear spot to eject the debris as the tab enters the slot.
Regardless of what you choose, I would HIGHLY recommend something heavy on the 3-point. Initially, I didn't have anything and always felt unstable. I added a 1200lb box blade, and things were MUCH smoother and controlled.