What food are you feeding your cavachon?

We currently have a 11 week old cavachon and we’re feeding it royal canin mini puppy food.

The vet had given us some hills food to try but he didn’t seem that interested.

I’ve heard purina pro plan is good for this breed but a lot more expensive.

What would you recommend feeding this breed in the long term?

He is a semi picky eater so any recommendations for treats to train him with would be great too!

TIA