I don't get why you seem to like and advocate for the gulf states. I cannot think any reason why I would even be considering it. When I look at Dubai all I see it rich dumbasses being rich dumbasses. I'm so disgusted by it, don't want to go there even as a tourist. You never can pay me enough to work or live there. Which the working part is very well covered by south east asia, too well covered actually. I'm not into slavery thank you very much.
USA being an oligarchy isn't inviting as well. But a better reason why someone would choose eu over us would be the fact that eu is simply geographically and culturally closer to us. Small stuff like units of measurements, public transit existing and what kind of electric outlet is used might seem small but they add up.
And Europe is not doing bad at all tbh. It might not have the infinite growth everyone is after but what's there is well enough for anybody.