It is supposed to make more of a difference with the contact line cartridges - think MMC6000, 20CL and MMC1 and 2. However if you think that almost all very high end turntables use radial arms, you soon realise that the benefits of linear tracking is on the whole outweighed by the disadvantages. It is much cheaper to make a good radial arm than a good linear tracking one.
B&O concentrated on the linear tracking models as the high end model for the range and these decks will have good suspension and are well made. However the sound from my radial tracking 3000 is in another class. Much deeper bass extension than any of the other Beograms. This would seem to be due to the record support as much as anything.
Linear tracking has big advantages for remote control systems and this I am sure is why the later decks are almost all linear tracking decks. The 4000 and 8000 decks were more about the short stiff arm and the precision drive of the arm. I think to an extent they sound good despite the arm rather than because of it though.
The B&O radial arm possibly takes lightweight that bit too far - I actually prefer the earlier incarnation than the last version. The cueing mechanism was always not quite right in my opinion.