Which is better on carpet?

The Xiaomi S20 has the clearer edge: 5000 Pa across three power modes. The Roomba 208 claims 70X suction but gives no pascal figure, so the S20 is the safer pick for deep carpet.

Which lasts longer per charge?

The Roomba 208, at up to 185 minutes versus 120 minutes for the S20. The S20 needs about 5 hours to recharge.

Is the S20 worth the extra?

At the listed prices they cost the same: $169 at Microless as of November 3 for the S20, and $169.00 for the Roomba 208 as of October 28, 2026. The S20 gives more suction and mapping for that money.

Does either map my home?

Only the S20. Its laser navigation builds maps and remembers them in the Xiaomi Home app. The Roomba 208 lists no mapping.

Which is better for allergies?

The S20, because it is HEPA certified. The Roomba 208 uses an Efficient Particulate Air filter without HEPA certification.

No for the Roomba 208, which needs no dock. The S20 auto-docks to charge on its floor-standing dock.

iRobot Roomba 208 Combo vs Xiaomi Robot Vacuum S20

Buy the Xiaomi S20 if you want proven suction and laser mapping in a light robot. Buy the Roomba 208 if you want the longest runtime and a dust-compacting design that needs no dock. The S20 lists at $169 at Microless as of November 3; the Roomba 208's only recorded daily price is $169.00 on October 28, 2026, so they are level on price.

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