I’ve only owned the Mk2, and I’ve compared it on the same system to a Mk3 and a Denon DP80. To my ears, the Mk3 was a very clear winner vs the other two, and the DP80 nosed out the SP10 MK2. I’ve since acquired experience with two more DD’s, These use coreless motors, the L07D and the TT101. In this respect and in others related to the design goals of their servo systems, platter mass, plinth, etc, these two are different from the first 3 I mention. The L07D and the TT101 seem to challenge the MK3, but they are not better. However, I would and do take either over the DP80 and the MK2. Therefore, I am tending to favor coreless motors, all other things being nearly equal. (The Mk3 has other features that raise up its performance uber alles.) On this basis, I would guess that SL1200G might outperform SP10 Mk2 but not necessarily the GT2000 (1200G and GT2000 do have coreless motors); I would want to audition that comparison for myself.