I promise you that I don't become angry.
With respect I think that's a bit apples and oranges. But okay, let's play the game. You say that you think that more people know about an elite fixture at the knockout stages, versus a leading second tier game. I don't necessarily doubt that.
I say that the revenue of the Premier League is broadly twice that of the Champions League.
Total revenue of the UEFA Champions League from 2010/11 to 2022/23
...but of course it's not all about money. How do the attendance figures compare?
The UEFA Champions league games have a verified average attendance of 36,898 per game.
The Premier league games have an average attendance of 43,034 per game.
I don't find it anything like as clear a cut case as you seem to that the champions league is the 'biggest'. Although perhaps if you defined what you meant by 'biggest', it might be possible to find a stat that backed you up.
I don't like either of them in their current form. I think it would be better in all sorts of ways if they weren't...but I don't see supporting the exercise in cleaving off the highest income generating clubs from the EPL, to subsidise foreign football, that is by definition less accessible to legacy fans, so that foreign clubs can become 'bigger', helps the football that I want to watch at all.....and the positioning seems to be pure marketing over observable reality at this point, to me.
The champions league was last won by a club whose fans mostly hate it.
But I'm genuinely interested in the counter argument, if there is a coherent one.