I’ve always thought that Metropolis had superior writing. It leans more toward architecture and urban planning, but the strong NYC ‘feeling’ of the magazine and the writing chops of its editorial staff meant that you would typically get good thought provoking content.
Most of the design blogs, I’m sorry to say, prioritize bite-sized sales/commentary that is either bland or excessively snarky, rather than any articulation of a complex or nuanced point of view.