My memory for general facts. My husband has ADHD that impacts his working memory, so he is constantly losing or forgetting things. Meanwhile my brain will remember where he put down his measuring tape three weeks ago and why he left it there. I also remember thing like song lyrics, history facts, fantasy/sci fi lore, and other stuff almost indefinitely. I do not have a perfect/eidetic memory, just a very good one, according to most people.
The downside of this is that it was cited as a main reason a psych, who agreed I met the criteria of being on the ASD spectrum, refused to give me an official diagnosis. He said that this meant I didn't have a specific special interest, and therefore I couldn't have autism. So now I have to find someone else who actually follows the criteria.