PHYS is a CEF rather than an ETF. CEF's almost always trade at a premium or a discount to their underlying assets. In the current market environment, you are going to most likely going to be paying a premium to own PHYS. If PHYS ever trades at a discount to its net asset value then by PHYS...otherwise buy GLD.
Recently, conspiracy theorists have been spreading rumors that GLD doesn't actually have all of the physical gold it is supposed to have sitting in vaults. If you believe that nonsense then pay a premium to buy PHYS instead and wear a tin-foil hat at all times to protect yourself from the mind-control beams that the government broadcasts from street lamps.