Samsung - T9 Portable 2TB vs SK hynix - Platinum P51 2TB

The Platinum P51 2TB is the clear pick on raw spec strength, leading by 37.4 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.

Pick the T9 Portable 2TB if you care most about interface. The biggest gaps in its favor are interface.

Pick the Platinum P51 2TB if you care most about sequential read / sequential write. Its strongest claims are sequential read, sequential write.

Both ship with comparable capacity, endurance (tbw), so those specs do not separate the two — focus on the differences below.

Bottom line: the Platinum P51 2TB is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.