Sonos Era 100 vs Era 300: What's the difference between the two speakers?

Sonos announced a new era of speakers - excuse the pun - in the form of the Era 100 and the Era 300 in early March, following several months of rumours and code names like Optima 2 and Optima 1.

Source : https://www.pocket-lint.com/sonos-era-100-vs-era-300-speaker-differences-compared/