Both are in tier A from this list,
PSU Tier List 4.0 rev. 14.8 (outdated) Last Update: 12-07-2021 Legend : Gray - EoL/obsolete and/or otherwise not recommended for purchase. Green - small form-factor (gold and blue colors are disregarded due to scarcity of SFX PSUs) Gold - best units in the tier (includes requirements for blue...
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the MSI however resides under the
( low priority units - minor issues or lack of info ) part of tier A where it might wel be for the reason that you can't find any real reviews about it like Ares here does.
If there isn't any real price difference pick the Seasonic would i say, but if the price difference is big enough would i just pick the MSI, it still has a 10 year warranty which should mean something.