Use the Hexa Code for the web.
Use the PMS references for the print.
On screen digital color simulations do not match the physical Pantone Color Standards. Refer to Pantone Color publications to obtain actual physical color standards.
Buy on Pantone.com
Adobe Color Table files can be opened with Adobe Photoshop. Several presets are already included in Photoshop's installation directory, in the Presets folder, but for new ones, you can import them like this: