The PC version, including the CODEX release and Steam version, has historically faced optimization issues such as stuttering, low internal resolution (900p upscale), and frame rate drops in cutscenes.
The "CODEX" mention likely refers to a popular scene group release of the game, while "Best" often points to the game's reputation as a masterpiece of storytelling and combat. What Makes the YoRHa Edition "Best"? Complete Content : It includes the 3C3C1D119440927 DLC nier automata game yorha edition codex best