I have not done a direct comparison of the three models. In my system, the CDS3 does a terrific job with soundstage. The stage is both wide and different placement of instruments, in terms of depth is easily discernable. Compared to my Sony SCD-1, which the CDS3 replaced, the CDS3 had a more realistic presentation of soundstage, even when the SCD-1 was playing an SACD.
I heard the Meridian in a Meridian system and the Linn in a Linn system. Overall, I preferred the Linn sound even though I am not a fan of their speakers (auditioned with Komri). It had a clear, but not thin or strident sound, and a relaxed, but not dull, sound. But, I should say that the Meridian system also sounded pretty good.
The Linn dealer is also an Ayre dealer. I thought the Ayre player I heard was pretty good too, particularly for the price.
The much ballyhooed stuff that I did not particularly like, which I heard in a system I am familiar with, were the EML DAC6 and the X-01 Esoteric. It may again be a system compatibility issue, but the sound was a bit too analytical for me. The DCS stack I heard was reasonably nice, but I found the sound a bit unengaging and dull (again, prossibly a system issue because it was not a familiar system). The Reimyo player I heard was nice, in many respects, but a touch light in midbass weight for my taste and not as dynamic as the CDS3. Still, this is worth looking into. But, if you are someone looking for the kind of magic that analogue sound delivers, you have to audition an Audionote DAC.