There is something inherently incorrect in the premise - Capitalism and Communism (Complete individuality and Complete ownership by the state) are the extremes - Socialism is, by definition, any compromise between the two extremes.
So the premise is like asking "White (Or Black) versus Gray" as if there was only one shade of Gray.
That said - I certainly prefer some level of compromise between those extremes:
A: Capitalism has the inherent advantage that working to improve your own life motivates everyone. Some people are also willing to work, in whole or in part, to improve the lives of others, but no one, no matter how charitable, is unhappy to have brightened up his child's birthday with the toy they wanted, or is broken hearted that today they can afford a better meal today than yesterday.
B: Communism has the inherent advantage that Capitalism exists at the intersection of supply and demand. Since that intersection point will never be at $0.00, there is always some portion of the population that cannot afford a good or service without giving up another more important good or service. Unfortunately, there is always a portion for whom that exchange involves that they cannot afford a necessary good or service, because there is an even more necessary good or service they would have to give up in exchange.
Once you've made that simple decision that it is worthwhile to grant a service to anyone, regardless of logic, reason, or self-interest, that they didn't completely pay for themselves, congratulations, you are a Socialist. I don't care if you consider yourself a libertarian that only thinks the Government should enforce Contracts - if they are doing it without you're paying them to do so, however short the line between that and Laissez-faire Capitalism is, there is a line there - and you are a Socialist.
Most people being in favor of the fire department coming out and police stopping muggings even if you didn't pay them personally to do so, what we are arguing about is to what extent we need to balance the proven motivation of using greed to con people into making stuff with the fact that most people realize that, at some point, there are things worth saving money on by doing as a group, and it make our lives better to go to a little extra effort to make sure people aren't in desperate straits, what we are arguing about is what degree of socialism is worthwhile.
Personally? Outside the very basics of a government like the technically 'Socialism' but agreed upon things like court systems and free speech? Well, off the cuff -
I'm a hierarchy of needs kinda guy: I want to cover the two bottom rungs with enough leeway to give people lots of opportunity to take a stab at the rest themselves - and that means a good educational system and access to knowledge. Sure it's Welfare. I really don't care - at the very worst you get a better class of criminal.
I want a common Infrastructure: There are a lot of things like roads, internet, et al that a certain class of idealogue always claims would be done by private industry. Yet, historically, have rarely been attempted by private industry, or in those rare occasions when infrastructure was created by private industry (Railroads being a great example), the monopoly on that infrastructure was leveraged to establish a stranglehold on an area.
I want good Insurance: Insurance is, fundamentally, hedging your bets by betting against yourself . . .and letting another guy take a cut. Now, there are obviously lots of specialized bets that the government has no business getting into, but any insurance system that virtually everyone needs (or needs a basic level on) is a reasonable candidate for the government to create an insurance system where the other guy's 'cut' is the slimmest margin feasible. Additional levels above and beyond that are outside the governments purview.
I want good Crisis Management/Prevention: Obviously, this is related to the Insurance question, but insurance is passive, Crisis Prevention is putting a good regulatory structure in place to handle foreseeable risks. Buildings in earthquake zones should be designed to survive all but the worst earthquakes. Cities in Flood zones should have levees that will hold back all but the worst floods. Management is dealing with the once a century crisis that was either unforeseeable, or foreseen, but considered to be easier to rebuild afterward than to plan against.