Why is Aptos a Solana killer?

Could you elaborate on why Aptos is being touted as a potential competitor or even a "killer" of Solana in the cryptocurrency space? What specific features or advantages does Aptos offer that could potentially give it an edge over Solana, and how do these factors contribute to the narrative of Aptos as a potential disruptor in the market? Additionally, what challenges or obstacles does Aptos face in its quest to become a formidable rival to Solana?