Take a look at these 2 links. They reveal a lot about the differences between mahogany and hard maple. The important stats are Elastic Modulus and Shrinkage. Mahogany is a lot less stiff than maple, but also moves a lot less with humidity changes. And that TR ratio of 1.4 is really good in mahogany and at 2.1 is really not so good in maple. http://www.wood-database.com/lumber-...uran-mahogany/ http://www.wood-database.com/lumber-...ds/hard-maple/
Conclusion, supported by experience, is that mahogany is a really good wood for necks IF you don't try to make the neck super thin, since it's more flexible, or if you add some graphite to increase its stiffness.
Another conclusion, supported by my own experience of making a lot of furniture and kitchen cabinets out of hard maple, is that it's actually better than the statistics make it sound. Still, it does move a lot, which is why Warmouth says "Maple must be finished to protect from warping." (http://www.warmoth.com/Bass/Necks/BassNeckWoods.aspx
Some day if we can buy sustainable Cuban Mahogany (dream on...) it will be the ultimate stuff for a lot of wood working. Actually a separate species, it is harder, heavier, stiffer, but still mahogany. I have never used it buy my dad has...