Highly subjective question, you'll have to do your own investigation

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(FWIW, finally being able to enjoy Serifs w/ the PW2 screen, I'm mostly using Crimson [which is free] & Adobe Garamond Pro [which is very NOT free]).
I'm not using the Touch much, but it's currently sitting on Libre Baskerville (which *will* crash the framework without a custom FT).