It is not appropriate to claim 'best gimball bearing arm'...etc, unless one heard them all, plus the fact that tonearm is part of the equation between cartridge, mechanical setup, turntable, a lot of variants in the equation.
The OL arm may be OK, but how can you know it is better than Rega RB1000, Wheaton VI, Schroeder, Immedia, etc?
Unipivot, the AudioCraft AC-3300, has a hybrid design, with a new implementation of 'Dualpivot'. The Naim Aro, could also sound a lot more musical, and the Moerch....
There is also another extremely rare arm, the Breuer Type 8, and the Type 7 which has the stylus/bearing/counterweight at exactly the same plane. Have you heard a Breuer?
In fact, on very heavy table with plinth that can take massive energy transfer, a gimbal bearing could sound very good, but on a less massive table, a unipivot by decoupling the effect of plinth to the cartridge, could be better.
OL/Rega design with minimal arm base, and a very stiff energy parth, required a very stiff and tightly coupled plinth design (Rega P9, for example), hence, they may not be optimize say, on a VPI TNT.