XEQT vs VFV for large amount long timeframe

All my registered accounts are maxed and filled with $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD(XEQT.CA)$ . I have about 250k I can invest that will not touch for about 15-20 years. Is there a huge difference in tax efficiency between XEQT and $VANGUARD INVESTMENTS CANADA INC S&P 500 INDEX ETF(VFV.CA)$ for a non-registered account, or am I just overthinking?