Maybe post a photo of the space you are looking at doing window treatments in. It really depends upon the look you are going for and style of house. Roller Shades are a huge trend right now because of the clean lines and various fabrics/colors that they are offered in.
Certainly dual rollers have a more contemporary look, especially when they are used with a sleek fascia. Dual rollers offer huge versatility in light control and have minimal upkeep (read- no dusting required :-) ). The big thing that is going to determine what you do is the amount of depth in your window as dual rollers require a fair amount of depth. I've attached a photo to give you a sense of depth though the requirements certainly vary with manufacturers
Two Blind Guys
Gordon's Window Decor
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