I wouldn’t recommend specific ones, but I would recomnend you try out distros with unique features. Such as an immutable one, one that is built from source, one with packages, one with snap, one with flatpack, etc.
This will help you understand and evaluate what you like.
Yes, it is a choice. I choose to delete cookies because it is the technique most websites use. Tracking plugins, canvas, webrtc, etc are harder to defend against and if they are all deployed by a tracking site, it is almost impossible to not be unique.
Used to live in Singapore and my recommendations are to use thin Uniqlo Airism tees or tank tops underneath your tee or shirt. Plan your routes so you know where to find aircon or fans, always walk slowly and make sure to hydrate. There are also body sheets that you can use to freshen up.