OUNZ VS Physical Gold

Realizing that physical gold, in my possession, is the best way to go, I have money in my IRA that , if invested in physical gold, has to be held in a Fed approved facility, such as brinks etc. placed under custodial care. I am thinking that perhaps a better way to invest may be OUNZ, but I have heard many negative things about "paper" funds. Anyone here have a clear understanding of the negatives of OUNZ as compared to physical. Thanks!