Ash Shaft
Dating back to my days working for Dufferin Cues in Canada, we sold a lot of Ash snooker cues so I am very familiar with it. Ash is very abundant in England, so it was commonly used in snooker cues and it was used in snooker cues here in N.A. because of tradition. They simply do not have enough good maple growing there for it to be used in cues.
Maple is actually a much better wood since it flexes the same in all directions, Ash is a bit stiffer when flexing against the grain. This is not much of a problem in really stiff tapers such as those used on snooker shafts but much more of an issue in shafts that have pro tapers such as those in pool cues. In snooker they also hit much lighter balls so the shaft flexes much less than it does in pool.
The openess of the grain and coarseness are the obvious drawbacks, Ash snooker shafts are generally stained as well, ash is very light in color just like Oak and it takes a good eye to know the difference between the two.
Stick with maple, it's a far superior material.
Best Regards,
Mike