What is more accurate: magnetic anti-skating, or barrel weight attached a fishline?

IMO the most accurate is able to deal with changing groove modulations and gradually increase force as it nears the inner grooves. This is basic physics; based on pivot arm design. Any out there that do this ? 

The Sony PUA 237/ 286 also uses some irregular shaped ''cam''

fastened at the collar of the arm (aka: vertical bearing). But this

''cam'' is connected with an tension wire which can be adjusted

in correlation with the VTF and/or stylus shape. I thought that no 

tonearm manufacturer copied this ''invention'' but just learned from

''some'' Aussie that Cobra and Coperhead (also from Australia)

made their own variation of this  invention by Sony .

Dear SunnyJim,

Initially, since A/S is a constantly moving target and whatever setting we use which sounds "good" to our ears is the "accurate" one, I confess I read your post with a slightly different interpretation i.e. "which of these methods has the least deleterious effect on SQ across the entire groove"?

.......I'd like to know the answer myself! ;^)

Dear chakster, I prefer the Lustre 801. Excelent tonearm but with

mediocre lift construction. And, as Raul already recommended, the

counterweight(s) should be used in the usual way avoiding magnetic

VTF adjustment. This way the counterweight(s) can be get nearer to

the pivot.