Marshall - Stockwell III vs Sonos - Era 100 Portable (rumored)

The Stockwell III is the clear pick on raw spec strength, leading by 21.3 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 Stockwell III if you care most about battery and low-end response. The biggest gaps in its favor are battery, low-end response, output power.

Pick the Era 100 Portable (rumored) if you care most about water resistance. Its strongest claims are water resistance.

Both ship with comparable stereo pairing, so those specs don't separate the two — focus on the differences below.

Bottom line: the Stockwell III is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.