No, much higher qualifications are required for Eb1-EA than NIW (if you are scientist).
It makes no difference using Eb1-EA or NIW when you are filling I-485, in terms of time taken to work on your case. Whichever gets approved first, go ahead use it for I-485.
It makes no difference using Eb1-EA or NIW when you are filling I-485, in terms of time taken to work on your case. Whichever gets approved first, go ahead use it for I-485.