I believe they are more popular since it offers more flexible. You can get dual lands, effect lands like wasteland, and regular lands instead of being stuck wi

I believe they are more popular since it offers more flexible. You can get dual lands, effect lands like wasteland, and regular lands instead of being stuck with any given one of the listed. You also get the benefit of lowering the odds of drawing a land since you've cleared another one out of your deck. Finally you get a chance to shuffle (which might matter in some decks).