I can't see how leaves are better than manure - they are different in chemical composition from each other. Leaves are basicly carbon and manure is basicly nitrogen. The best would be to add both to the soil in the fall NOT in the spring. Leaves require time to decompose and use nitrogen to do it so you could be locking up nitrogen at the time your plants require it. Manure is too hot to add in the spring as there is not enough time for it to break down. Rabbit and llama manure (to the best of my knowledge are the only ones) can safely be used fresh, unaged, actually straight from the animal without harming plants but don't try that with any other manure.
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Tom
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