So, I’m asking community:
1)Which leagues do you find the most predictable in terms of match outcomes?
The league you should be betting on, should be the league you watch the most because you'll be able to observe some patterns in the league you watch the most that will make it more predictable to you. When you try betting on a new league that you do not watch their games, you may think that doing a research before betting may be enough to help you choose, but it is sometimes not still enough.
The best chance to increase your winning potential in soccer leagues is to bet on the league you watch the most.