Moultrie and Cuddeback each have their own portable SD card viewer that is used for viewing and storing pic's from trail camera SD cards.....not sure which is better but that's 1 option to consider!
I usually pack an extra SD card for each trail camera and simply swap them out in the woods then I view them at home in the computer and delete what's good and worth saving....if I get too many and fill up a SD card I go to the local Store and have a CD/DVD burned to keep the pics and then delete the whole SD card and start out fresh with a blank card!