Expense ratio's aside, and assuming that funds are in tax-advantaged accounts, what's your reasoning for choosing Total Stock market over Extended market?
Total Stock market is comprised ~80/20% of S&P 500 and Extended market.
Hence, if Total Stock market is outperforming the S&P 500, it is due to the Extended market.
Are you hoping that the Extended market will outperform the S&P 500, but want to hedge your bets? Otherwise, it would seem to me that one should either pick the S&P 500 or the Extended market (you either believe in the Extended market or not).
What am I missing?
I didn't find the right solution from the internet.