No one mentioned the Stihl carbide chain.
I mostly run the 33RD3 chains and I rarely need to have them sharpened, dirty wood or not. The local Ace Hardware charges $7 to sharpen them. You can not touch them up. I have read posters say that carbide is slower. If they do cut slower, I have not noticed and do not mind. I mostly cut dead ash, hickory and oak for firewood. They are more costly. They sell for around $100 for a 20" (33RD3-72) 3/8 .050 at Ace. You can get them on Ebay for about $75.
One other thing to note, they barely take off any material when they sharpen them. My guess is they will stretch beyond use long before the cutters wear out.
Ace Hardware charges $7 to sharpen them? EVERYBODY charges 7 bucks, to sharpen ANY type of chain tooth. Thats no measure of quality.
I'll bet your ACE Buddy isn't doing much more than selling a Saturday regular, more chains.........while making 7 bucks for the cart boy.
Carbide chains are far superior, the top of the PRO food chain, and would last the lifetime of a poke n hope weekend warrior woodsman. Sharpening them is rare unless wire, or stone gets hit.
Heres another perspective, from a Senior Woodsman.
Carbide tipped chain is designed for rescue and demolition work, it will cut clean wood but is slow. It does need to be sharpened periodically but very few shops are equipped to do it. Stihl and Rapco are the only manufacturers I am aware of. At over three bucks a link, I suggest a box of files and learn how to use them.
Good Luck with those exotic chains!!