The withholding tax issue has validity for some accounts, and ZSP can be better for some accounts. With an indicated dividend yield of 1.3%, the withholding tax on ZSP can be 0.195%. The additional tax hit is relatively minor. But, ZSP should be preferred overall. VFV has been a 'go to' fund for us for awhile, and we note that five year returns on the two are identical. But taxes can play a part here. HXS we like but many investors do not understand the swap/derivatives so we often mention it after other ETFs.
Authors of this answer, directors, partners and/or officers of 5i Research and/or affiliated companies have a financial or other interest in VFV.