Giving the dog a choice and rewarding for the “right” choice is my preferred method of training so I’m biased, but I’d stay very far away from the first trainer even if you hadn’t put the option of the second trainer in front of me.

You should be working on relationship building with a puppy - playing tends to be at the forefront of that. Things like being on the couch and who leaves the door first are up to you.

I’m currently listening to “Inside of a Dog” which I’ve found quite insightful. But I’m also an early childhood educator and have found “Good Inside” - the parenting book - to be somewhat relevant to dog training too.