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My experiences with Qatar Airways have always been excellent.
I have only tried Etihad’s business class, and while it was okay, they canceled my return flight from Thailand, so it wasn’t as good as Qatar Airways, where I have never experienced any changes that drastically affected me.
The business class product itself, although not consistent due to a variety of seats across aircraft, tends to be very comfortable.
The hub is busy but easy enough to navigate and is definitely better (for me) than Dubai airport.
Abu Dhabi, after its revamp, is now a better airport than Doha, but Doha is bigger.
Overall, if I had all three options in front of me for business class, I would choose Qatar Airways if I could ensure a proper business layout.