I am not sure why conversations about whether Jews were treated decently in Muslims lands always turns into a debate about how much worse the European persecution was. Both of these statements are true:
1) Jews were treated terribly by their Muslim rulers.
2) Jews were treated much, much worse in Europe.
And while I admonished those that need to make the comparison, I will add that an argument can be made that Europe also treated its Jews better than Muslim rulers. In Europe, Jews would go through phases where they were loved and cherished by their rulers. Poland adopted special laws to attract and protect Jews. “Paradisus Judaeorum.” Of course, it never ended well and the untold suffering eventually unleashed on the Jews is unrivaled.