1. Very similar expense ratio with VTI at 0.03% and VTSAX at 0.04%. 2. Extremely similar returns over equivalent periods of time. 3. Further, the overall performance of the two is roughly the same. 4. These income-generating investments have nearly identical yields: 1.81% for VTI and 1.80% for VTSAX (as of 5/31/2020).