Depends what you want to use if for. The dash is more like a phone with pda capabilities, while the wing is more like a pda with phone capabilities. The dash will be easier to operate with one hand, and doesnt have the ability to create/modify word/excell/powerpoint documents. The wing is more like a pda, but the phone does suffer some because of it. Take advantage of tmobile's 15 or 30 day return (depends on where you are) and try each one out. Then keep the one you like.