I have seen that most of the experienced BHWers have said they use a combination of more than one tool... like ranker x and gsa together. Ranker x for 2.0s and various links from T1 to T2, and GSA for T2 to T3. From what I have read on BHW, some of the tools do different things, but they also have some sort of feature(s) that is common. I guess it won't matter if you pick one tool to start, but eventually you will be using more than one to get the desired effect of your links.