1)Which leagues do you find the most predictable in terms of match outcomes?
The Championship, Premier League, and LaLiga are quite difficult to predict, even if you bet on a mid-table team, but betting on a big team is more likely to win, so it's easier to predict.
2)And which leagues are the most unpredictable, where you can’t always rely on teams' form or stats?
The most difficult leagues to predict are the Champions League and the Championship.
I don't know why, but because they rarely win in these matches, especially the Championship, maybe because I rarely watch them, even if I choose my favorite team, they can still lose.