Every economic system is defined amorally.
Same goes for science.
Only religion is where morality is prescribed.
(And where it's practiced the least.)
I'll go with that good ole atheistic capitalism.
It has the greatest likelihood of being moral.
Or just less evil than all alternatives.
My own view, frankly, is that hatred of capitalism is primarily an issue of envy.
Yes, it is true, capitalism (like every other human creation) needs some rules and constraints. Not willy-nilly, but based on the ability to show how such constraints would prevent the damage that a focus only on "increasing shareholder value" can manifestly do.
But the envy comes in when so many of us see that some people can get a lot richer than most of the rest of us. Well, it is my opinion that Bill Gates (for example) put in thousands of hours of efforts creating Microsoft in competition with (mostly) IBM. And then he brilliantly got them to buy into his small system operating system, rather than be bothered building their own. His own effort, and negotiating ability, allowed him for many years to have a near monopoly. (Later, when IBM tried building OS2 to compete with Windows, they failed miserably.) Gates is very rich -- and he earned it. I don't begrudge it to him.
He's only one example, but there are many others, where people used their creativity, their intelligence, their hard work, their ability to accept risk and invest in their own work, have made them likewise rich. (Then, of course, there are the one's like Trump who inherited tons, squandered a lot, and used legal trickery to salvage himself -- but no system is going to prevent the cheating outliers.)
Envy is a terrible reason to not like something that works, on the whole, so well.