Question 1

Which is better, Seagate Expansion 4TB or WD Black SN850X 2TB?

Accepted Answer

Both products scored 8.5/10 in our testing — it's a tie. Choose based on which features matter most to you.

Question 2

Is the Seagate Expansion 4TB worth it over the WD Black SN850X 2TB?

Accepted Answer

The Seagate Expansion 4TB scores 8.5/10 while the WD Black SN850X 2TB scores 8.5/10. The Seagate Expansion 4TB is our "Best Overall" pick in the Best MicroSD Cards Under $25 2026 category.

Seagate Expansion 4TB vs WD Black SN850X 2TB: Which to Buy?