I don't think there is one "best"...but there may be a best for a given situation.
Each of the various diamond offerings, plated and bonded, offers strengths as well as weaknesses.
I use both plated, (usually DMT but some other "lesser" versions as well), and bonded, (Matrix, Venev), depending on the steel and the type of sharpening required (or desired).
Also, I believe that David, (Diemaker on the forum), may be coming out with bonded diamond bench stones similar to the "Matrix" stones he makes for the Edge Pro system. How far off that may be I do not know.
All that said, while there may not be a single "best", you can certainly get most of your work done (at the very least) adequately with any of the aforementioned systems.
I'm sure others will have differing viewpoints. Mine is just one.