Leaf mold

I have a number of different trees on my land, including plum, pear, apple, magnolia, pussy willow, silver birch, oak, walnut. I diligently mow up as many leaves as l can to make leaf mold. My question is: are there any particular leaves which have more nutrients, when composted, than others? I wonder if l should be more selective in what l collect. I do wonder whether oak leaves and walnut in particular, are worth the effort?
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Cause he thinks she melts when he touches her
She knows she's the chocolate girl
Cause she's broken up and swallowed
And wrapped in bits of silver
It improves the structure, and pretty much all leaves from deciduous trees will do that.
Does it turn into compost?
I am thinking that the best stuff I have ever seen was a 25-30 year old build up of needles under the yew tree at our old house, which did magnificent things to a veg garden.