Depending on the tax bracket and the state, they might or might not be.
At the top tax bracket in NYC or CA, you have iirc 35% federal + 13% state so almost 50%, and that’s not all of it (there’s payroll tax, social security etc).
Products in the US are cheap, but services are expensive, and healthcare is tied to your employer.
My impression is that if you’re young, healthy and without children, the US is much cheaper.
But e.g. putting a kid through college is $200k in the US vs free in the EU.