My thoughts are walks are for the dog, not the human.
My approach is that if I ask for a heel, it needs to happen. Otherwise the dog is free to sniff, wander and look around. As long as they aren't dumping me on my head they can do what they like. Garbage day it can take the better part of an hour to get around the block.

 

Dog is with me, not the other way around.
He walks without stopping and he gets several breaks with the “Go sniff” command.
Peeing and pooping happen on my property, not on someone else’s.

 

I guess I’m kind of in between the two responses already given. The walks ARE for the dog, but they’re also for me. Walking isn’t much exercise for a dog usually, so the most they get out of it is being able to sniff. The dog is not allowed to pull but can wander as far as the leash allows (while not being completely taut) to sniff and explore. Under no circumstances do I allow my dog to drag me in a direction to smell something. That was one of my biggest pet peeves when I was a dog walker for a living. I dig my feet in and pull backwards, sometimes accompanied by a verbal correction, whenever my dogs try to do it. They learned quickly that it isn’t allowed.

 

Both. They need to learn to walk where you want them to wall and they need sniffing time. If we are out in a place with lots of smells, we sniff first, then when he’s tired, we walk purposefully.

 

my male pup is about the same age as yours. this is my take on sniff-stops:

if this is the first time youre going to a place with you pup (like a hiking trail or park) they are naturally going to be more alert, excited, cautious, curious, etc. on these initial visits i allow my pup to sniff ALOT. the more they sniff, the more they will be able to stimulate their senses and become more comfortable with the new environment.

the less distracted they are in the environment they are in, the more likely you can gain/keep their attention and teach commands more effectively. as the pup becomes more normalized with that area, the less they will stop and the quicker you can move them along. naturally, its about creating a positive association with the area and people in it, at the end of the day.

however, you are the leader and need to be able control any situation. if you have to drag your puppy from a spot of interest, that is behaviour that needs to be corrected sooner rather than later.

so tl;dr: at new places, allow more time for your puppy to explore and absorb. on return visits to the area you can then start training the dog to respond to you when you determine its time to move on, whenever thay maybe.

hope that helps! stay safe out there.