My understanding is that the semi-pointed tips started to show up around the beginning of the viking era and became gradually more popular as time progressed. Presumably one is better for tip cuts and the other for thrusts.
The swords would all be blade heavy, with the blades getting longer and thinner over time as metallurgy improved. They're cutting and chopping blades with some ability to thrust. Optimized for fighting with a large shield, and thus presumably mostly used offensively, they're often ill suited to the more agile and defensive techniques used in later periods when shields were no longer universal.
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