It depends on BOTH the store and the puppy. My female started very young and she did well, never used a prong on her, she was trained on a flat collar. I love that trainer. She does rally and titles her own dogs in obedience, so it shows in her training. My male couldn't do well there in the beginning and excelled in a GSD club. Now we could go there and he would be fine. I tried another Petsmart with my golden puppy, while I thought she was also a good trainer, I felt it was more rushed, I now travel an hour to get to first trainer with golden. He can be difficult, so he also goes to the GSD club once a week.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD