Which platform, betterment or etrade, offers better support for buying and selling cryptocurrencies?

I am trying to decide between betterment and etrade as a platform for buying and selling cryptocurrencies. Can you provide a detailed comparison of the two platforms in terms of their support for cryptocurrencies? Specifically, I am interested in knowing which platform offers better features, security measures, user interface, and customer support for cryptocurrency trading. Additionally, I would like to understand the fees associated with buying and selling cryptocurrencies on each platform. Based on these factors, which platform would be the better choice for someone looking to trade cryptocurrencies?