Of course if you’ll want to check award availability on Cathay Pacific (CX) or Dragonair (KA) it’s best to use either web site, both booking systems are identical except for the colors. British Airways and Qantas also show CX awards but I think the CX web site is easiest to use.
One tip is when checking for awards is to always check one-way availability, even if your itinerary is roundtrip. This is because the one-way search with flexible dates will bring up a weekly calendar of the days with the lowest available reward. Once you see there is availability for the date / flight you want, then you can do the same one-way search for the return leg.
If you search roundtrip, only business class awards are shown. But if you check one-way, you’ll see there are economy class seats available. You’ll just also need to find a date where the return is available in economy class to get that economy roundtrip award pricing.
I find one-way award searching the most efficient and accurate way to check awards with CX or KA. If you only use the roundtrip award search, it usually will price only the higher award buckets since one of your legs may not be at the lowest cost. The main drawback of the CX booking system however is that it doesn’t allow visibility of awards on partners. AA, BA, and QF usually have the best systems for checking multiple carriers.