What is the highest level of professional soccer?

Related questions

1. Which is the toughest soccer league?
2. What's the most watched football league?
3. Which is the toughest football league?
4. Which soccer league pays the most?
5. Which Football League is the most competitive?
6. Which is the most competitive league in Europe?
7. How is UEFA club coefficient calculated?
8. How does UEFA club ranking work?
9. What is UEFA club coefficient?
10. Which league is the most competitive?

Tags

1. #level
2. #division
3. #better
4. #considered
5. #arguably
6. #bottom
7. #champions
8. #first
9. #strongest
10. #world
11. #league
12. #highest
13. #teams
14. #probably