What is the difference between Coinbase & Gemini?

Could you elaborate on the key differences between Coinbase and Gemini? I'm particularly interested in understanding how their services, security measures, supported cryptocurrencies, and user experiences differ. For instance, does one platform offer more advanced trading options than the other? Are there any significant differences in their fee structures or deposit/withdrawal methods? Additionally, how do their regulatory compliance and customer support compare? A detailed comparison would be invaluable for making an informed decision as a cryptocurrency investor.