I'm not sure if there is an overwhelming advantage to the cloth, but we enjoyed them. They are very tough. No rips tears or blow outs. They hold a good volume. they were listed as ##lb bags but we easily were stuffing a quarter to half pound more.
Zero shrinkage, wrinkling or loose casing issues. They stay in contact with the meat but are easly pulled away.
I knew a guy in Arizona over Facebook. He was a big fan of them. He did fabulas cured, smoked and dry aged projects. The bags are ideal for that.