Don't ETF's have distributions as well?
For example, I looked up the ETF VTI and the similar MF VTSMX. At Vanguard, they both list similar quarterly distributions (dividends).
What am I missing?
Distributions consist of dividends and capital gains. You'll get dividends from both mutual funds and ETFs.
This article ETFs: Tax-Efficient, Not Tax-Exempt from Morningstar today has an analysis of ETF capital gains tax efficiency.