The one that stands out to me is the Hawaii flag.
I prefer ours myself !
Down in the Antipodes I think the A,C,T, (capital territory, like DC) has the best state flag.
Texas plain and simple red white blue with a big star
I'd have voted for Phoenix, if you were considering cities too...
South Carolina ,It's always looked the best to me. It's subtle in design, yet shows all that it needs to. It's classy and looks good on a t-shirt
India has the coolest flag consist of three colors with their different symbols and consist of one Ashok Chakra having 24 lines. Proud to be an Indian.