According to the Syracuse web site ED does not impact your consideration for merit or financial aid. I don’t think they would make this statement if their is an institutional internal bias (which sounds logical) that if you agreed already to go then we won’t offer you any money.
You’ll receive full consideration for financial aidLink
All Early Decision applicants receive the same consideration for financial aid and merit scholarships as Regular Decision applicants. Should you be admitted, you’ll receive your financial aid award soon after receiving your admission decision.