They are going to be about the same. the problem with a yorkie-poo is it is a mixed breed. if the puppy is more poodle you could be fine, if it is more yorkie you could have problems. You really need to be around them to see if you are allergic. good luck
It's hard to tell, because Yorkiepoos are mixed breeds, as was mentioned above. You'll see the same thing with Goldendoodles or Labradoodle - if they are more poodle they won't shed, but if they are more lab or retreiver, they will shed.
I'd suggest spending time with yorkies and with poodles, to see if you are allergic to either breed, and then decide what to get. If you're worried about allergies, you could get a toy poodle - it's small like a yorkie and dosen't shed. Good luck.
P.S. I'm not entirely sure about this, but I believe that the curlier the fur, the less it will shed.