The article seems to say that "B" is the best manuscript:
Quote"What is most necessary now is an edition such as has been long promised, showing the true tradition of the text when BPFCo (and any other good MSS.) have been stripped of the interpolations introduced by Byzantine or Italian scholars. The effect of interpolation superimposed on multifarious errors due to careless copyists is a diversity more apparent than real, which deceives only superficial examination. For we may reasonably assume that a single stray copy, brought to light in the ninth century, was the parent of all extant MSS.2 The true text, it is agreed, is often preserved by B alone ; yet F, on which Cobet relied, is not seldom right, though it also palms off makeshift conjectures. Whether the class of inferior or interpolated MSS. supplies any genuine readings independent of BPF is a question sometimes raised ; in any case, not much is to be expected from this quarter. All that can be done by the most careful collation of MSS. has already been done for the more valuable part of Laertius—I mean the fragments of other authors with which his work is filled. Thus Usener has edited Book X. in Epicurea (1887)"