In many cases, you will simply be choosing the Android app that your broker offers because choosing the right broker (pricing, support, tools, available assets, account types, and so on) is more important than choosing the best app. That said, there are brokers that offer more than one Android app. E*TRADE and TD Ameritrade are both examples of brokers that have an app for casual investors and another for sophisticated investors and traders.  While it is great that mobile brokerage apps have added more and more features from their desktop platforms that typically contain more functionality, this doesn’t matter nearly as much as determining what features you currently use, or might want to use in the future. If you will be entering options positions on the go, for example, you are probably going to need the trader-focused version for more robust charting and analysis. If you merely want to check how your portfolio is doing,then the more casual app will suffice. Once you have an inventory of what you want to do through your mobile device, you can choose which app to use if your broker offers casual and trader focused versions.