Should I be using a harness for my puppy?

Hello Everyone,

I have a 12 week old Scottish Terrier. He loves his walks and is doing quite well on his lead with his collar. However, I have been told that I should be using a harness to protect his neck. I've since read mixed views on this so I thought I would ask for advice here directly. Should I get a harness? And if so, what type would you recommend? I would rather not spend too much as he's growing so quickly. 

Any Idea , Suggestions would be appreciated,

Thanks,

I didn't find the right solution from the internet.