My plan was to invest it with Betterment, because I felt like that was the easiest and cheapest "set and forget" solution. But would there be substantial upside in going directly with a Vanguard fund instead? I'm really new to this and the convenience of a dedicated interface like Wealthfront/Betterment feels valuable to me, but if I'm leaving substantial money on the table doing that I'd rather go to the extra effort of figuring something else out.