First playthrough here; I feel like I'm approaching the endgame and, while know a couple things from what my friend said like there being two(?) endings, I'm playing mostly blind. I just want to know what exactly decides the ending you get and which one is better for more content, regardless of story context?

Also, its safe to beat the final boss before doing the DLC, yes? I won't be forced into ng+ or miss a new ending the DLC might add?
>captcha WRR4PP