It's similar to the argument about whether results or performances are more important. Which makes a league better: quality or competition?
Based on quality, according to
UEFA's rankings, the PL is as close to Portugal as they are La Liga and the only English clubs in the top 10 are Chelsea (who have got worse every year since 2012) and Arsenal (who have been the same since 2012). Since 2012, only Chelsea has made it to the semi finals (they've done it twice in 4 seasons). La Liga has managed 8, Bundesliga has managed 5 and Serie A 1.
So the score for semi finalists is:
- La Liga = 8 (Real Madrid 4, Barca 3 and Atlético 1)
- Bundesliga = 5 (Bayern 4 and Dortmund 1)
- PL = 2 (Chelsea 1)
- Serie A = 1 (Juventus)
So the best of the PL are clearly behind the rest in Europe. In the Europa league, the PL clubs don't even seem to care which is unfortunate as they are probably the strength of the PL.
Based on the current league tables, the PL is more competitive but if you just want competition, why not watch the Championship? The PL is more competitive and the mid table clubs have improved ito finances but the top sides have gotten worse and worse. Arsenal have been the same (roughly) for years, Chelsea have fallen off a cliff and City can't decide if they're bothered. We are a football team that doesn't like football, Liverpool have declined over the last decade or so and Spurs are Spurs.
If you want drama and excitement, watch the PL. If you want to watch the best of the best, they don't play in the PL and it's been a good few years since they have.