Hello,
Both tools are very similar, the main disadvantage of i.MX8MSCALE DDR Tool is that it is no longer being updated. The latest available version (3.31) does not include recent bug fixes that are continuously incorporated into the DDR tool of Config Tools for i.MX.
Because of this, the training by i.MX8MSCALE DDR Tool may no longer be considered valid, especially since there is an actively supported tool available.
Best regards.