My dogs have a command when they are allowed to break heel and go off and explore on their own. Until that command is given, they are at a heel. After I recall them, they are at a heel. But as soon as they get the command to take the lead, they can go ahead and explore and sniff.
Personally I think its easier for your dog to be at a heel until it's properly trained to listen. From there you can add different things in for the dog. You need a foundation to build on before you can get to a level where you can trust the dog to go do its thing and to reliably return to your side when you tell it to.
Whatever you choose to do its up to you. As long as you are comfortable with the situation and neither you or the dog jeopardizes anyone else its cool.
Personally I think its easier for your dog to be at a heel until it's properly trained to listen. From there you can add different things in for the dog. You need a foundation to build on before you can get to a level where you can trust the dog to go do its thing and to reliably return to your side when you tell it to.
Whatever you choose to do its up to you. As long as you are comfortable with the situation and neither you or the dog jeopardizes anyone else its cool.