Quick thought:
When discussing these things, it's easy to try and decide which is the better ideaology by referring to which real-world examples have done well or haven't. The problem is, all our real world ones so far have been flawed in various ways.
Communism, in practice, tends to be incredibly corrupt, and mostly used as a tool to keep a populace dirt poor and unable to effectively fight back against a dictatorial police state, rather than it's otherwise worthy and utopian "from all according to their ability, to all according to their needs" core values. Everyone would have a good life, but be required to contribute also. In reality the civilians work hard for a small share of an even smaller pot, and the ruling class have it very plush, and the military get an unfairly large slice of the pie - either for expansion and bullying, or just keeping people down.
Capitalism, somewhat the reverse. Implementing the purest interpretation of the idea would have monopolies, syndicates and cabals all over the place, charging as high and paying as low as they could get away with, leading to a similar highly polarised oligarchy. Somewhat like Victorian Britain, perhaps. But this model is "tainted" by regulation and other altruistic/philantropic, human drives, which temper it and have instead resulted in fierce competition instead of (generally outlawed!) collusion, often a commie-style guaranteed minimum income (outsourced "third world" workers excepted ... though they're often getting more than they could by subsistence farming), and a great deal of choice, leisure time, technological and social progress and safety-netting.
It's all a big mess...
In summary, THEORETICAL communism "isn't that bad" - in fact, it's arguably a much better model than capitalism. But in PRACTICE, the human factors that have - so far - been in evidence in the competing governmental styles seem to run in reverse to what the models suggest. Maybe it's possible to get a properly altruistic, empowering communist society... just depends who sets it up and runs it. But we haven't had it so far.
(And it's that sort of thing that makes me highly suspicious of governments doing otherwise abhorrent things "for the best", "for your protection", and waving that awful phrase "if you've nothing to hide, you shouldn't be worried"... OK ... and once all this stuff is in place, then they change the idea of what needs to be hidden to include previously innocent people including yourself, then what? It's not like there isn't historical precedent for that kind of crap)