Assume you are talking 3/8?
8 tooth is standard stock item can be had anywhere, 9 tooth is a racing sprocket and you need to order from Madsens or Dansco directly. They are about 4-5 times the price of a stock rim.
I fear many would dissagree with spurs being best due to a lack of support to the chain on the underside and a lot more point loading, but anyway making spurs to adapt onto splne drives would involve custom and quite specialized machiening that I am sure is going to cost some $$$. The broaching required to make the internal splines is not always something a small shop will be set up to do.
I have even used the 9 and 10 tooth Dansco rims cutting firewood and after several days cutting there was no significant wear that would concern me.
Maybe the rims you tried had pins too small, seen a couple that used pins that were only about 1/8 in diamiter these I could see being hard on the drive links, the sprockets with pins in the 3/16 to 1/4 inch range mesh with the drivers much better and have greater contact area.
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