I'm my limited experience, the type of leaves can dictate what tool is used. We borrowed a Protero vacuum to try it but it didn't do much for the tiny leaves. We have a ton of Willow Oaks and their slender leaves like to burrow under and in the grass. I had the most success with a backpack blower and rake (for the really matted areas.I'm looking for the same answers as the OP. I have a bx-2680 with a 55" grapple, bucket, stump bucket, sod buster plow, 60" center mower. I still have loads of leaves (a couple of acres worth) left over from last fall.
We had raked them into a series of piles. Many of the piles are on a fairly steep grade.
I got some success using the grapple. One advantage of racking them in the fall and letting them sit through the winter is that they have become "lift-able" with the grapple. I can pick up a clump that is about 5 feet high, wet and packed. I pick the pile up and take them over to the compost heap. But I still have a lot of leaves to rake.
I am still looking for a solution for the remainder of the leaves.
Big leaves would be eaten alive by this machine. Just not the little guys.