If you wanted to store USD on your cold storage for, lets say one year, which stablecoin would yo trust the most to still be worth 1 USD in a year?
none of them because it is a very foolish thing to do. if you want to store fiat then store fiat in your bank account or store it as physical cash under your mattress! you will be a lot safer that way.
I ask because I simply dont trust Tether. I think the day could come where it is either regulated out of existence, or its lack of USD reserves causes it to crash and burn.
not trusting has nothing to do with having reserves. the problem with stable coins is their centralization that means they can easily disappear if some day something went wrong with them. specially when they are created and controlled by an exchange (bitfinex) it becomes even riskier.