It allows you to break up your Photos and app images among multiple Photos libraries rather than store all of them in one giant library. You can easily switch between libraries or browse the photos in your libraries directly from PowerPhotos without opening each library in Photos.
Use a single library to hold a smaller collection that you sync with iCloud while keeping the bulk of your photos in separate libraries so they don't take up space on iCloud. It can analyze your libraries for duplicate photos, showing them side-by-side and letting you eliminate extra copies of photos you no longer need.
It also supports searching all your libraries simultaneously to help track down a particular photo. If you use iCloud Photo Library to sync photos with your other devices, splitting up your library can help save on iCloud storage costs.
Improved iCloud Photos support: If you use iCloud Photos, PowerPhotos 1. x can only see photos in your library that have already been downloaded to your local hard drive. For users with the "Optimize Mac Storage" option enabled, this could mean a significant portion of your iCloud library would not be visible to PowerPhotos. PowerPhotos 2.0 can now see and work with any photos in your iCloud photo library and automatically download photos from iCloud as needed.
Advanced exporting: Photos has an export command but is pretty limited in what it can provide. PowerPhotos 2.0 has a new, more fully featured export function with options such as
Export as a flat folder or as a folder hierarchy in the Finder that mimics your album hierarchy
Export unmodified photos, or as JPG, PNG, HEIF, or TIFF of different sizes
Include captions, dates, keywords, and titles in EXIF metadata
Retain or strip location metadata
Optionally include videos from Live Photos and all photos from a burst
Set Finder creation/modification dates to the photo's EXIF data
Video export support as H.264 or H.265
Global menu bar item: Get fast access to your libraries via a global item in your menu bar even when PowerPhotos isn't running.
Library groups: For those with lots of libraries, you can now organize your libraries into groups in the PowerPhotos sidebar.
Multiple windows: You can now open each library in a separate window in PowerPhotos, allowing for easier comparison between libraries and dragging and dropping photos/albums between libraries.
New duplicate search engine: PowerPhotos 2.0 uses a new duplicate comparison algorithm that can find more duplicate photos which are not quite 100% identical, such as scaled-down copies of photos, photos that have been resaved in a different format or with different compression, and even photos with minor edits applied to them.
Faster library loading: PowerPhotos 2.0 has rewritten many of its internals to load your library much faster than PowerPhotos 1.0.
Improved AppleScript support: New support for copying albums or photos between libraries, merging libraries, and exporting photos/albums from a library.
JPEG, HEIC, GIF, PNG, TIFF, Photoshop (PSD), BMP, Fax images, macOS and Windows icons, Radiance images, and Google's WebP. RAW formats: Leica DNG and RAW, Sony ARW, Olympus ORF, Minolta MRW, Nikon NEF, Fuji RAF, Canon CR2 and CRW, Hasselblad 3FR. Sketch files (preview only). ZIP-archives.
JPEG, JPEG-2000, PNG, TIFF, BMP.
MacOS 11.0 or later