Judas Priest for me. I like Iron Maiden’s instrumentation but I just can’t stand Bruce Dickinson’s vocals. I don’t really like the Blaze era of Maiden and I’m not a fan of their early stuff.
Judas Priest were a lot more exciting musically and more consistent across their albums. Halford era JP is my favourite, although he can have the odd off night live, especially now he’s getting older.