Why Betterment over Future Advisor? I really like the latter, but haven't really looked into Betterment all that much.
They both do the same thing, tax loss harvesting and automatic rebalancing. That fee difference over 30 years assuming an investment of 20k per year and an 8% return could cost you like 400k - which is not chump change.
It seems to be roughly the same idea, but without any fees at all (I haven't used any of them, so I'm likely missing something)