While blue is the easy and tempting option, and I would live comfortably without needing to work ever again…
I would choose red. Considering I am approaching 40, and going by family history, I’ll likely get cancer in my 50’s or 60’s… I think choosing red is a good solution to basically get extra 30+ years of life.
Also, with the forenowledge, there is a huge potential for life saving actions. While I don’t think there is much I could do as a kid, it’s worth a shot and I would have time to figure it out.