H1B case received but want to switch a company

I received an offer from AWS Trusted Advisor. Pay is better than company A (investment bank) and the profile I have at company A is a mix of machine learning and Software engineering. I am about to graduate next week. I got selected into H1B lottery this week and ironically I received an email from immigration attorney on the very same day I was going to write them about not joining them. Amazon immigration lawyer advised me to join after October 1st,2018 but my recruiter is not agreeing with that process. Should I continue to work for A or should I accept an offer from AWS? I will have to cancel this year's h1b process if I opt for AWS Thanks!