Earlier quoted context omitted.
Neither option is better than a Vanguard account with one of their target date funds (or funds targeted by level of aggressiveness). Vanguard is a mutual company; they exist for the benefit of their users. Hard to compete against that. Disclaimer: moved from Betterment to Vanguard
Could you explain a bit more? Are you making a better ROI? I currently have a Betterment account and would consider switching if there's a good reason.
However, all of the things Betterment does for you now would be your responsibility, including asset selection, rebalancing, thinking about how to manage taxes, etc.
The bottom line is that you can do this yourself for less money, but you have to do it all yourself. Betterment offers more convenience for a higher fee.