AC's article compares the POW/POS/Lachesis consensus mechanisms, stating that Fantom is the only blockchain with sub-second finality

ChainCatcher message, Yearn.finance founder Andre Cronje published a comparison of POW, POS, and Lachesis (Fantom consensus mechanism), stating that the Fantom consensus is horizontally scalable, with the complexity of communication remaining unchanged as more participants are introduced, and it has an inherent time order. Therefore, he believes that Fantom is the only blockchain with sub-second finality. (source link)