LaLiga is equal to EPL at the top but not downwards from that.I'm comparing eras to show you there is no clear link between more money and better elite performances. The increase of money of EPL teams is just a bubble so far. It doesn't translate to any superiority. It mostly means you pay 80m for players you used to sign for 25 15 years ago.
It's a gold mine for smaller clubs, the feeders for these big clubs who simply sell at a much higher price point.
LaLiga is equal to EPL at the top but not downwards from that.
Outside of Madrid, Barca, Atletico, the LaLiga teams don't compare to their EPL equivalents.
The mid table and relegation in EPL is far stronger than that of LaLiga. You have to put a lot more effort into beating the West Hams or Fulhams than you do beating Espanyol, Getafe etc.
Don't think it's easier to beat Getafe and Espanyol away than those EPL sides. I've explained this. Often bigger teams prefer other teams to have more offensive quality so they play more open. Smaller Spanish sides away sit back and make it a chore. They play realistic and pragmatic football, often negative and distructive, adapted to their means. This is a different kind of difficulty.
Take Bilbao vs Barcelona. We beat them 3-0 no issues, but struggled like hell to teams like Leganes and Getafe. Because we had more spaces as Bilbao didn't sit as deep and wanted to attack also.
In EPL it would be like we'd play more often vs Bilbao, Villareal, and Betis vs midtable sides.
I watch about 20% of what I used to years ago. Still enough to draw comparisons between the specific difficulties of La Liga vs EPL. Different situations, but both posing problems.