Except if you have PowerPC Macs or MBPs that can only run Snow Leopard max.
But I use Dropbox for my iPhone too.
That said, no important picture remains on any device. It's always backed up to media somewhere. I don't use iCloud for storage at all, except my normal iDevice backups.
As I've said many times, I could lose everything on my device and be okay because nothing important is stored permanently on it. 3500+ photos wiped out? Great, I just cleared out all the screencaps and shopping pictures that have cluttered my camera roll since 2012.