I have the problem of selecting wood for making casings and baseboards and other architectural trim. In my situation cost is not an objective.
The millworkers I currently use prefer sapele. The problem with sapele is that it is dark, oily and has a relatively deep grain, so that makes it difficult to paint (most of my trim is painted white). So, what happens is that the primer tends to soak into the sapele, then it has to be re-sanded and primed again, repeat over and over. Also, a lot of coats are necessary to cover the naturally dark shade of the wood.
One obvious improvement would be genuine mahogany which is lighter in color, less porous and less oily. The main drawback is that it is more difficult to obtain genuine mahogany and so lead times might be longer.
Naively, I have suggested maple which is light in color, hard, has a tight, easily painted grain. However, the millworkers say it is unusable for casings because it tends to twist. If this is true, one creative workaround might be to use a maple butcher block which will not twist, but how well butcher block mills, I don't know.
I am interested in other suggestions.
One wood I am looking at is sweet birch. It is pretty hard stuff and looks close grained from the photo. How is it for stability? Does it tend to twist like maple does?