Orijen or AATU puppy for 8 month Jackchi puppy

Hello
I have an old month Jackchi (chihuahua x jack Russel ) who has been eating tails.com food, unfortunately the food doesn’t agree with him very well. I have been looking to switch him to either the AATU puppy or Orijen puppy as they are both highly rated and would appreciate some opinions on which would be best for him?
Thanks!

Hello and welcome to the forum. You can see a comparison of the two foods here