The Emirates contracted for the best available aircraft, which is the F-35, but relying on it alone is impractical, so it is really better to acquire the Rafale.
The UAE has great experience with French planes and has a huge stockpile of ammunition, and the Rafale F4 offers a remarkable improvement and a very satisfactory performance that allows it to work alongside the F-35 with all the comfort and strength. In addition to the Emirati masterpiece Global Eye (the Emirates contracted two additional planes, bringing the total to 5 in the future), we are talking about the most technologically advanced Arab air force.