It's your account and your comments. You can do with them as you wish.
That's the point. If you don't wish to leave them behind to be profitable to Reddit, that's also your choice. I don't feel strongly about your choice to do it one way or another. Personally, I nuked my 15yo account and all comments completely because I don't want to leave anything valuable behind to make profits for a company that I feel doesn't deserve them.
The point is, those comments were mine, not theirs. I don't want them selling them for profit, especially to an LLM mill.