Why Comparing $VANGUARD S&P 500 INDEX ETF TR UNIT (VFV.CA)$ ...

These ETFs are often put head-to-head against one another across many investing forums and social platforms. However, what some investors don’t realize is that overanalyzing and overthinking these ETFs in search for an “edge” is—more often than not—a complete waste of time.
Any type of “edge” an investor finds between the trio are largely subjective in nature (based on personal preference), too irrelevant to consider meaningful, or lack academic evidence to support a claim that favors one ETF over the other.
One notable difference between the trio is that VFV and XUS both hold their US-domiciled ETFs, VOO and IVV respectively, whereas ZSP elects to purchase all 500 companies listed in the S&P 500 directly as its underlying.
Does this difference affect the performance between these ETFs? — No, these products are functionally identical regardless of how the fund manager attempts to replicate the index.
Additionally, if you were to backtest the performance between the trio, you would find that it is near identical (+/- tracking error, differences in fees/expenses, etc.)