probably the internet history, it would be kind of like a Friday night news drop with all the other bullshit going on. also I use Firefox and mull with history turned off so have fun I guess.
I'd choose the thought reading and hope they don't know it's my thoughts and they think they're having intrusive thoughts and create crazy-ass scenarios. If they know for a fact it's my thoughts, I'd go play Poker in Vegas and just lie in my internal monologue and create false narratives.
I'm autistic so 99% of the time I just say what I'm thinking pretty directly, and also (big surprise) I am quite happy being solitary, with occasional social interactions, but no one really 'knows me' or is some kind of person I regularly communicate with.
As someone with d.i.d. and have multiple people in my head constantly talking with each other. I would want people to read my mind because it would totally break them and get them extremely confused.