Neoliberals, and even more so social democrats, are among the most (effectively) conservative candidates in a certain sense. With the understanding that pure capitalism is so unsustainable that it will eventually destroy itself, social democrats, by undoing some of the harm caused by capitalism, only seek to conserve it.

Of course, I think they're (social democrats, not neoliberals) a better choice for now, since they don't work to actively harm the working class. But in the long run, they are what's keeping capitalism afloat. I don't know what's the way to escape the clutches of capitalism without causing complete societal collapse, but social democracy ain't it.