According to the books, would geralt work to kill radovid?

I just finished the game for the second time, it’s amazing!!, but letting radovid live and kill non humans, while ciri is roaming as a Witcher feels kinda off

So I know there’s no canon regarding the political stance but I read few other posts where others say radovid lives and proof as he’s still present in the gwent expansion.

Is my ending right? I know there’s no wrong or right. But wondering if lore geralt would not interfere in these businesses and just prefer to be neutral and protect only his people. But also wondering if geralt will allow a threat to his family be present. I first chose the nilfguard winning as my ending, but this time I let the world take its course and frankly mutants and non humans burning and cruelty by humans seems to show the cruelty of the real world and Witcher books. “There’s always the good and the bad” stuff

So what do you people think? Which is your preferred ending ??