Which do you prefer? They both seem to have features that the other lacks. One thing I wish Photos had was the ability to email photos as this seems ti be lacking, unless I missed something. You may respond and say that E-mail is dead, but then I will respond and tell you that I usually do not use social networking or image sharing sites (Flickr) to store photos. So for that reason I am using iPhoto, however its sluggish and kinda buggy. When Photos gets better I think I may switch. One annoying bug in iPhoto is when I try and share images to Messages I sometimes get a message "Cant communicate with helper application" and it gets tiresome. Any ideas?