What are the most interesting and useful trees to grow? Oaks seem to give the most bark and branches (and also three logs when cut down), while fir trees seem to give the most boughs. Apart from that there are apple and hazle-nut (though it's not (yet?) listed in the wiki, I suppose one can grow such a tree from a nut (y/n?)) for food, mulberry trees for silk production + food and willows for the look.
Is there any sense at all in growing birch, fir, elm or maple trees?