my understanding is that using bitcoin, you will not have to worry about your crypto being frozen.
Could there be any reason for tether being advantageous in such transaction?
Besides the long confirmation time, the volatility of bitcoin is also a reason, I really don't want to pay in bitcoin because I don't want to incur any additional loss if bitcoin volatility. Bitcoin could be profitable in the future so using it really feels wasteful, while tether or stablecoin is not profitable and is no different from fiat, so I would use that instead of bitcoin.
To me, bitcoin is an asset, an investment. I am trying to accumulate as many bitcoins as possible, I only use them when I have no other choice, other than that, I will hold them until I reach my goal.