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In my opinion manually backlink works great. However, it is very time consuming as we all know. It is up to you guys what to do. Internet Marketing is testing, testing and testing over and over again to see which strategy works better.
All are great ways to build backlinks, but make sure that the pages you're adding your links to are also indexed. That's really important. Thats why bookmarking is a great way to get started with building backlinks. It's usually not as powerful as "article marketing" per se, but it's probably the best thing to do when starting your linking campaign since it is really easy and doesn't take much time at all. After doing that, move to the more powerful ways of building quality links that tend to take a little more time.