For example, USD 10,000 is the absolute maximum you can bring into or take out of the US, or move between accounts in the US, without intrusive and possibly annoying declarations of source of funds, and potential exposure to instant civil forfeiture if you are deemed suspicious [0].
Stablecoins may not be practically subject to these restrictions (they may have other very serious risks and limitations, but not the same ones as USD).
So choose whatever currency is best for you. Isn't it nice to have a choice?