Vanguard is finally exporting the growth-versus-value debate.

After hitting snooze once, Vanguard has launched two new ETFs—Developed Markets ex-U.S. Growth Index ETF (VDG) and Developed Markets ex-U.S. Value Index ETF (VDV)—giving investors simple, low-cost tools to tilt their foreign stock exposure by style.

Let’s start with what’s easy. The new ETFs are cheap (0.08%), diversified and perfectly sensible building blocks.

But cost and convenience aren’t the issue. The real question is whether a growth or value tilt is worth making in the first place.

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