Pros

  • 64-bit enabled.
  • Helpful Refine Edge feature.
  • Easier merging of HDR images.
  • Many community-driven improvements.
  • Lens Correction filter uses camera/lens profiles.
  • Better noise reduction in Camera Raw.
  • Convenient Content-Aware Fill feature.

Cons

  • Many plug-ins/filters work only in 32-bit mode.
  • App generally does not feel much faster.