I wouldn't worry about line ups, there'll be something there to float your boat whenever you go.......its ibiza remember not your local town where the choice maybe cheese or rnb (no offence to be taken here its just an example of the everyday town in the UK ) on a friday/saurday night. There is something on every night for everyone, That's the beauty of it!!
you make a very good point, seems like every night there's at least one club that has something good to offer!