I think ash ,although a low moisture content wood can and will warp as it air dries .As such a smaller diameter log usually will warp more .I've had some that came out furniture grade and some better served for firewood .No matter what it is air dried ash is hard as granite .If you have carbide cutters these are very handy to use on working this stuff .You can't drive a nail short of a big ball peen hammer ,piolet holes for screws etc .