Which writer/speaker appeals to you is also pretty much a reflection of your own stage of personal development / growth, and things like your own personality.
Brian Tracy was a big hero for me, at one stage of my life (which wasn't that long ago, really, it was around 2003 - 2005). But I feel that I've outgrown his books now. Of course, if I go back and browse through them, I'd still find a few useful tips etc, but by and large, I've outgrown him.
When I was seriously applying Tracy's ideas at that time in my life, I achieved a lot of success (by my own standards, in those days). But it required a lot of work, a lot of effort, a lot of action ....
Now I continue to achieve success. But on an even larger scale, and in more areas of my life. And with much less effort and action ....
And my secret is ...............
Hicks; Chopra; Haanel; Seth; Dyer; Silva. Enuff said.