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Critics of Sword Art Online often miss the series' deeper themes by fixating solely on gameplay mechanics, which sets it apart from titles like Shangri-La Frontier. While the latter emphasizes skill and competition, Sword Art Online delves into the psychological complexities of its characters, exploring how the virtual environment affects their mental health and moral choices. Kirito's journey highlights the emotional weight of survival, the trauma of taking lives, and the struggle to protect others in a high-stakes world(he killed red players). This focus on the darker aspects of human nature, as well as the consequences of living in a virtual reality, elevates Sword Art Online beyond mere gaming and showcases a nuanced narrative about identity and morality.

Also they are more like side quest story in the anime, they have no real objective or main story in Sanghri-la frontier.

If you really want, you should compare Sanghri-la with many other similar MMORPG title anime.