Original is far better. The only caveat could be that you need an X1X or higher. I'd rather buy OG than play 2 Black via GP. Let alone pay 50 bucks for it. They essentially sell you the Sigma 2 part of Master Collection redone in UE5, and even compared to S2 there is some stuff removed. Granted 2 Black as far as the campaign goes is a tad better than Sigma 2. It has blood and a slightly higher enemy count. But the areas still feel off, everything has been opened already and some parts are still ghost towns.
Just buy the original. Enjoy the viscerality of it, the UT Windmill and bow, explosive kunai and the controlled chaos of the optional Tests of Valor.