If anything, experience from China has shown that the early slots are not better. The mortality % has gotten better over time as they've figured out what works, what doesn't, and how to properly manage the disease. For example, there's some retrovirals being given now that appear to be successful to some degree. That wasn't known in the early progression of the illness.

Odds are decent an even more effective treatment will be found in the coming months, and if you can stave off your infection date till then you'll be better off (which of course presumes that you will get the virus at all, which is far from a given).