Personally I'd prefer your own words with GPT tasked to just correct grammar instead of rephrasing it. The GPT-generated rephrasing sounds very off to me due to

Personally I'd prefer your own words with GPT tasked to just correct grammar instead of rephrasing it. The GPT-generated rephrasing sounds very off to me due to the formality it introduced in your tone, it flourishes the comment to sound "proper" in a formal tone but completely misses the informal aspect of a comments' section. I'm not a native speaker either, sometimes I re-read some of my own comments and realise I could have phrased them much better, corrected some grammar but I prefer that they sound like me.