If you need live memory searching, you want Action Replay Max or a standalone tool like PS2RD . But for 90% of users who just want infinite health, max money, and unlock all characters—v101 is all you need.
Some will argue that Codebreaker v11 has a nicer GUI. Others will say that v12 supports more "advanced codes" (like dynamic address modifiers). But the consensus in speedrunning and emulation communities is clear: codebreaker v101 iso better
: The Codebreaker is a cheat device designed for the PS2. It works by allowing users to input cheat codes that can modify game behavior, such as making a character invincible, increasing health, or unlocking levels. If you need live memory searching, you want