If the USA had to change from federal to Unitary or Confederate, which one?

[vanguard96]

I picked confederacy because it would be decentralized and reduce the imperialist tendencies of the US overseas.

Generally speaking I'd rather have secession than a civil war. I'd rather have a smaller government than a larger one. Given scarce resources I think it would quicken the move toward private solutions less reliant on government funding, subsidies or partnerships.