Both Seattle and SD are strong biotech hubs. Seattle has Fred Hutch, SD has the Salk Institute and Scripps Research Institute. But then again, Toronto is good for that too, with a lot of major hospitals in the viscinity driving research at the university. If you’re looking into internships, the biotech arms of big pharma are more in SD, though Gilead has a new site in Seattle, and Novo Nordisk is also there…
You’re picking between pretty equally good biochem/biotech schools for academics and reseach opportunities, imo. Maybe check what kinds of in-department funding the schools have for summer research scholarships since a lot of NSF and NIH scholarships are restricted to US citizens/permanent residents.