undecided (Orijen vs. Wellness)

I need to switch my 10 week old puppy from Canidae to something as she's having diarrhea most likely due to the food (worm checked, etc). I read a lot about Orijen and Wellness and I would welcome opinion from folks who have used both. I'm going to switch her to a large breed puppy formula and they both seems since. I realize that what works for one may not work for another, but needless to say, I would like to make up my mind by hearing about experiences with both brands.

My concern with Orijen would be how difficult (or how easy would be) for the food to get spoiled. I will be looking at expiration dates/keeping in a dark cool room but also I don't want "the (bad) food because i didn't keep it the way it should" upset her stomach. Is the food that "sensitive" to the environment? :help: