I'm trying to hold foreign funds in taxable, to get the foreign tax credit. VWO/VEIEX for example, EM index, has about .25% forn tax credit a year lately, and under 2% distribution per year last 3 years. With the new vipers, I expect it to be pretty tax efficient in future.
If all foreign funds are already in taxable account, then one to consider is VTI. Quite tax efficient, as the vipers can slowly eliminate low cost basis shares when people are selling, and the old mutual fund can take losses on redemptions by selling high cost basis shares, and the index doesn't need to be rebalanced--it's the total stock market.
If you mean active funds, then I'd consider foreign, tax managed, and/or low turnover. One that comes to mind is TAVFX, mostly US, but has had low turnover so probably tax efficient.