Ranking seasons based on how important they are to watch before Blood vs. Water. Mostly based off of how many people from these seasons are competing, and who is the most important to the season in Blood vs. Water. I will just leave the list without reasoning in fear of spoiling any of these seasons
10. Survivor: Pearl Islands
9. Survivor: Cook Islands
8. Survivor: Panama - Exile Island
7. Survivor: Samoa
6. Survivor: Australian Outback
5. Survivor: All Stars
4. Survivor: Borneo
3. Survivor: Tocantins
2. Survivor: Heroes vs. Villains
1. Survivor: One World
Keep in mind that Survivor: Blood vs. Water will spoil a lot of, if not all, of these seasons. However, if you only intend on watching a few seasons beforehand, I think that this list is a good one to follow.