Now I will give you a different perspective. How much was point gap between Barca-Real Duo & next best team
2010-11 : Real(2nd) at 92 & Valencia 3rd at 71. 21 points.
2011-12 : Barca(2nd) at 91 & Valencia 3rd at 61. 30 points
2012-13 : Real 2nd at 85 & A.Madrid 3rd at 76. 9 points. Barca at 100, so A.Madrid were 24 points behind the winner.
2013-14 : A. Madrid won. Next best behind Barca-Real Duo. Atletic 17 points behind
2014-15 : Real 2nd at 92. A.Madrid at 78. 14 points behind
2015-16 : Top 3 within 3 points, so fair play. Next best still 24 points behind.
So out of last 6 seasons, 4 times Barca-Real duo had literally no competition as per your own method. That League is just not competitive beyond those two in terms of title contention. Until recently no one would even bet on any other than those two.
It is really a Spanish version of Scottish league, dominated by Rangers & Celtic.
Whereas PL has atleast 3 clubs in Chelsea, United & City who consistently compete for league with Arsenal thrown in middle a few seasons.
Next best after top two
2010-11 : Zero Points. City 3rd level on points with Chelsea 2nd. both 71 points, 9 behind the leaders.
2011-12 : Arsenal 3rd behind leaders 19 points behind
2012-13 : Chelsea 3 points behind and Arsenal 5points behind City at 2nd place.
2013-14 : Chelsea 2points behind and Arsenal 5 points behind Liverpool at 2nd place
2014-15 : Arsenal 4 points behind and UNited 9 behind City at 2nd place
2015-16 : Spurs 1 point behind & City 5 behind Arsenal at 2nd place.
La Liga has seen Barca, Real & only once A. Madrid as winner of La Liga in that period. ONly those 3 competed.
PL has CIty, Chelsea, United, Leicester win the title.
United, CIty, CHelsea, Spurs, Arsenal, Liverpool, Leicester...That's 7 clubs who have competed for title and 4-5 of those teams compete every season.
So which league is more competitive?
No need to even bother with Bayernleague.