Ok, we got off on wood in another thread, lets do a thread on wood that you find best for cooking.
There are many kinds I have never used because they don't grow around here. My favorite is Osage Orage, but it takes some other wood to help keep it burning it is so hard. This is where Red Cedar can be usefull. I have used Red Cedar for dutch oven cooking, but although the best of the local conifers, it takes a lot and makes it hard on the cook.
I've used a little Sugar Maple, but although it is good, I see little of it. Green Ash is a common tree around here and is fine wood, as well as Red Oak and Burr Oak. I see a little black Locust sometimes, although good, I haven't used enough to really say much about it.
The tree kinds of elm are very nice, American, Siberian (Chinese) and some Red Elm. It breaks up into nice coals. Mulberry is a good local one as well as Hackberry. The one that surprised me is Black Walnut, although it burns hot and slow, when it burns it does not form much coals but rather burns into mostly a fine ash.
As you can tell out here I'm limited by species, the well known Cottonwood is to soft and is not even as good as Red Cedar. I'm sure the orchard type fruit woods are good, but I see very little of them.
So what works in your area?