Wool tallit with blue stripes
If you want a traditional tallit, unless you're on a shoestring budget, make sure it's wool. A wool tallit looks nicer, lasts longer, feels better and is considered superior from a halachic standpoint.
Many Sephardim have a custom of wearing a white-striped tallit, Ashkenazi traditionalists will stick with black stripes, but the blue-striped wool tallit...