What condition is generally required for a 1990s Spider-Man comic to be considered 'most valuable'?

For a 1990s Spider-Man comic to reach its highest value, it typically needs to be in near-mint to mint condition (often graded by professional services like CGC or CBCS as 9.4 or higher). This includes factors like sharp corners, a flat and glossy cover, and no major defects like tears, creases, or discoloration.