Google's version (photos.google.com) is great. I love the auto-generated albums, animated gifs and movies. It's also very easy to share and create group albums.
I was using Google Photos until really recently when I decided I'm just not comfortable giving them that much un-gated insight into my life... Switched over to iCloud and I have no regrets. Google did some fun/novel things with my photos and their ability to render hundreds of photo thumbnails quickly on my mobile was impressive but I can live without it for privacies sake.