Unrestrained capitalism end with selling drugs to schoolchildren - it has no ethical aspect other than profit.
No country has such a system of total free market
When you look around the world you see countries whos markets have various degrees of freedom from Noth Korea where it just doesn't exist, through Cuba and China where there are limited free markets through to places like the US where there are strict laws in some areas like insider dealing.
For me it's not a question of 'different systems' as much as where you place the slider between state control and private enterprise.
Generally I think we've done quite well in that slider in this country. I think some areas like Rail infrastructure might have been better staying in public hands and there was a clear worldwide failure to recognise insufficient restrictions in strategic financial institutions like the banks.
But it also depends on your values and what you want out of the system - the US has a bit of a 'devil take the hindmost' attitude which shapes their policy but that's not one I'd want to follow. Generally I find those who do don't really care for their fellow countrymen if they happen to be poor or disadvantaged.
Although strangely they always seem to think they are patriots