Which is better for building backlinks for your site? Commenting in blog or posting in forum? The answer is BOTH! They are both great tools to market your site. You should think of marketing your site like an investment stock. Do not put all your eggs in one basket. There is not ONE best method to market your site.

What you can do is split the time between posting in a forum and posting comments instead of focusing too much on one. If you normally spend one hour posting in a forum, then try half an hour of posting in forums and half an hour posting great comments on other peoples' blogs. Not only are you building backlinks, but you are also networking with people.

You can have the best contents on earth, but if you are not marketing yourself properly, you won't get much traffic to your site. Always diversify your marketing strategy like the stock market. Post to a few forums in your related niche instead of just focusing on "the best" forum. Imagine that forum ever gets shut down for whatever reason, all your hard work of posting in the forum is gone. Same goes to blogs because you can't expect any blogs to last forever. Your favorite blog can disappear the next day.

You see a lot of sites that talk about which method is best for building up backlinks and pagerank. The truth is that they don't even know either because Google is constantly changing the algorithm of how pagerank is calculated. So what should you do? Diversify your marketing techniques by trying out many ways to build backlinks instead of focusing on just one or two methods.