What makes certain Marvel comic books stand out as 'the best' in terms of storytelling and artistic quality?

The 'best' Marvel comics often excel in several areas simultaneously: groundbreaking storytelling that pushes boundaries, profound character development that makes heroes and villains relatable, innovative artwork that defines an era, and themes that resonate with real-world issues. They typically achieve a perfect synergy between writer and artist, creating memorable moments and lasting legacies that redefine the medium and influence subsequent generations of creators and fans.