An RB300 used on an early LP12, for example, wasn't the best match, and this in this sense the Ittok could unquestionably sound better (read here, more lively, and hence 'preferable' to many listeners). The main problem claimed for the Rega in this set up concerned poor bass performance, it tending to sound muddy and ill defined. Of course, one might expect the Rega to lose out against the Ittok in this set-up, as this arm was specifically designed and developed to work on and with the LP12.
However, this is not the end of the story, because the the outcome of comparison between these arms turned out somewhat differently when the Rega was mounted on a Roksan Xerxes. In this configuration, the Rega easily competed with the LP12/Ittok. Indeed, and for many listeners (reviewers and enthusiasts alike), the Roksan/Rega rig outclassed the LP12/Ittok rig by a fair margin and it was not long before people (some of whome had been extreme Linnies for years) began leaving the Linn marque in their droves. The reason for the differences in results obtained between the decks, some argued, was that the Rega was simply showing up a weakness in the Linn's bass performance (well, it was argued, it works just fine on a Roksan!) Of course, and perhaps rather tellingly, not long afterwards Linn revised its bearing and the way it was attached to the subchassis with the Cirkus mod kit, which oddly had the effect of 'cleaning up the bass'). I leave you to draw your own conclusions here...
Let's also not forget either that the above 'early' comparisons were most often being made using Rega's with their bog standard arm wiring fitted (re-wiring and structural mods to the Rega were not common at this time). Thus, it is possible that a modded arm, fitted to a new spec'd Sondek, plus Origin Live mods might well slaughter the equivalent Ittok, and possibly more, depending on your tastes. Indeed, Tobias reports, albeit from second hand sources, that people have told him that his modded Rega sounds better than an Ittok!
The shear cheapness of the Rega in comparison to the superarms is also a massive disadvantage in terms of how dealer loyality can be split between the Rega and the manufactureres of expensive arms they stock, which broadly translates to biased selling and promotion of products. This is basically because dealers risk alienating the manufaturers of expensive arms. After all, if you were the manufacturer of an expensive super arm, would you feel comfortable having your product demmed against an arm that may cost hundreds of pounds less than yours, but may only compromise slightly on its performance (with fitted arm lead and normal counterweight)? I know what my answer would be, but does this help the enthusiast that only wants the best music they can afford?
Along the same lines, the profit argument is also especially significant: the Rega simply has less of profit margin as compared to the Linn arms, and so dealers cannot so easliy absorb the cost of demonstrations. Factor in that the Rega is so good to start with, and you can perhaps begin to appreciate why Linn would not encourage comparisons of the Ittok and Rega.
Taken together, I therefore feel that arriving at a definitive judgement as to the absolute merits of these 2 arms is very difficult to make. At the very least, arriving at such a judgement requires anyone interested having to make a fair comparisons between both the current spec'd and modded gear of each manufacturer.
I hope this helps!