In my opinion if you are new to bitcoin world and you don't want to take any kind of risk you are likely to land at coinbase. Especially when you have a considerable amount of money you want to invest. For example don't see a hollywood actor who discovers Bitcoin going to Binance. So this exchange has a specific category of investors imo.

Coming to Robinhood i think the simplicity of the app makes it more handy for long term traders or swing traders. That kind of trading when you buy low and sell high once in a month. Despite the fact that it does not have advanced trading features the release of their API (coming soon) is going to be a great opportunity for many day traders as you can plug it to Desktop interface or even delegate the trading decisions to a bot so you can make high frequency trading at zero fees. I don't know if the API will be tweaked to avoid high frequency trading or even will it be a free service .