soupconBoth are great R2R multibit dacs, and the best way to convert PCM Redbook 16/44, 24/96 or DXD.
Assemblage 3.1 or MSB platinum
The Assemblage 3.1 uses the last and best chip form R2R converter the PCM1704 with the best HDCD filter the PMD200, great combination if done right.
The MSB Platinum uses discrete R2R multibit dacs and their own programmable filter, also very very good.
If this were me and I had the choice without an a/b comparison, I would go with the MSB Platinum.
Cheers George