What is the Difference between Blog Commenting and Quality Link Building?

Which is most effective?
Share your oinion about it.

Hi,
Blog Commenting is one of the process of Quality Link building.
All the Off-page SEO processes helps you to make quality link building for your website and blog commenting is one among those processes. Other processes are:
- Social bookmarking submissions
- Directory submission
- Classified submission
- Forum signatures
- Article submission

and many other processes.

HI
blog commenting is done for the backlinks , and good comment on high PR blogs can provide quality backlinks .