SPY is the one I always here people talk about. Looking at both now & VOO has a lower expense ratio, and for some reason a *slightly* higher yield. Any reason to own SPY over VOO?
For investment they’re nearly the same. Splitting hairs with total returns. For day trading SPY definitely better. Compare min.1 charts.
SPLG is the "investor" version of SPY and pretty close to VOO in expense ratio. More commentary here.