also note that recently Qatar is usually MUCH cheaper!
So it is easy choice: cheaper and better product is Qatar.
In the past, before COVID, it was not this way, Emirates was much cheaper in J then Qatar (in some cases one could have Emirates F for the price of Qatar J... )
Because I just need flad bet I was flying J in Emirates.
But now I'm using Emirates only to fly Economy. For business it is CHEAPER to fly Qatar and you also get better product.
That depends entirely on your routing. I have not seem QR to be consistently cheaper than EK ( or v.v.)