It's your decision, and I hate Reddit and Spez ever since they decided to do the whole API thing, but personally, if I were to close my account, I wouldn't scramble all of my comments and posts. It makes it harder for people who still search for answers to questions on reddit to find what they're looking for. You aren't preserving valuable information with this, you're destroying it.
I scrambled years worth of comments into a statement about the fuckery Reddit has committed and left those edited comments intact while deleting my accounts.
This serves a couple of purposes:
Devalue the platform by destroying information, with the explicit hope that it fucks with Google results and that people will leave if enough people salted the earth on their way out
I deleted all mine, but I don't feel bad as I don't think I posted a single thing of value in about 100 pages worth of comments.
I'd rather leave people pissed off at reddit when they go into a thread and see missing comments. Ideally they will look up the deleted post, then realize it was someone trolling
I debated that for myself, but in the end I still scrambled all my posts and comments. Some were really a loss, I honestly think, but it is a price I'm willing to pay. It is my content, after all, and Reddit has made it very clear that monetizing it by selling it for AI training is part of their business plan. So I went ahead and reluctantly pulled the switch.
I did download everything earlier, so I have a local copy. And most of my OC is also posted elsewhere, so it's not a huge loss, rather an annoying inconvenience. Which I'm fine with, all things considered.