I met a friend at a star party last month, and he was using QHY294 color pro, and we compared my ASI183MM pro & ASI533MC pro vs the QHY294 color. The conclusion was:
1- Both companies use the same sensors from Panasonic and Sony
2- ASI has a little advantage of having auxiliary USB ports in the back of the camera which act as a free USB HUB and thus reduces the burden or cables a little

Other than that, both have the same features, and ASI for me works very well with INDI/KSTARS as well as QHY to my friend with KSTARS...
 I use the QHY Polemaster, and I was surprised by the quality of this small camera...

In general, IMO they are neck to neck in the race...

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