WeTYC;
Are the 18poe ratchets still readily available?
Another thing is customer support. CK and Hadley should be super?
HWTXXX00NSK24S is the DT part number for an 18-pt hub service kit with two ratchets, springs, and grease. It's US mail-order price is typically around US$50. That's basically a full free-wheel rebuild.
In comparison, HWDXXX00N2884S is a pair of 36-pt ratchets and it goes for ~US$100!
When they introduced the 36-pt upgrade, it retailed for closer to US$50 but after a year or so they decided to double the price. (I can just see that meeting, "Hey, now that it has a proven track record for lasting less than 1/4 as long, let's double the price!")
Oh, and the most recent 18-pt ratchets I've seen have the extra "lightening groove" machined into them like the 36-pt ones in your smaller picture. (Earlier 18-pt ratchets are solid)
I know nothing of DT's support either through Canadian or US distributors because I've never needed it.