According to me, Blogger Commenting System is best for any blog. Mohammad is also using it on his blog (MBT). It have a clean design and easy to use. And to stop spamming, you should moderate your comments manually. This is the best way to take away spammy comments from your blog.
My second choice is Disqus Commenting System when we talk about design and responsiveness. The advantage with disqus comments is, it allow you to block some spammy words. But spammers can still leave spammy words using *. So again, the best way to take away spammers is manual moderation.
And about your problem, Naman has already given you the solution for it. But Blogger has given an option for this. Just go to Basic Settings and Under Basic, Click on ‘Privacy’ and choose ‘No’ on both of the options. (as shown in picture)-
lastly, Click on Save Changes Button. Isn’t it simple?
Hope It Helped You!..