And besides, Champion of Europe > Champion of England .....isn't it?
Guess it depends where you live
No it doesn't. It depends on the challenge involved.
If we accept that the biggest clubs are expected to get to the quarter finals of the European Cup minimum, that gives them 5 games to win the European Cup over 6-8 weeks. Depending on the draw, you could get e.g. City in the quarter finals, or you could score in 5 minutes against Porto and win 6-1.
To win this league, means being the most consistent team over 38 games in 9-10 months, against all types of teams, in all kinds of conditions, and not always with the strongest team. Games can be played at lunchtime and the next one nearer bedtime. Some can be played in 30c or -3c. Others can be played after a 2 week break, or during Christmas with less than 48 hours between them. All kinds of banana skins in the way to deal with.
The domestic league is always harder to win and carries greater reward. That's not saying that we should ignore the European Cup. The biggest clubs try to win everything they enter, and so should we.