With the appearance of the hiltless sword bayonet, such as the socket-mounted variety, their use on the end of the musket or rifle also became a hindrance during the reloading of the muzzle-loaded longarm, (a common problem to all muzzle-loading infantry weapons). A bayonet of similar style and dimension was used on the Lee–Enfield rifle of the early 20th century.
However, the advantages of sword bayonets over spike bayonets are evident. Where a spike bayonet turns the rifle into a spear, a sword bayonet turns it into a glaive. Unlike spike bayonets, which can be used only for thrusting, sword bayonets can also be used for slashing, except for the épée bayonets. Twisting a sword bayonet in the wound was especially lethal. Before the advent of modern medicine after World War I, a soldier struck by a sword bayonet was very unlikely to survive.
While most sword bayonets have straight blades, a popular variant in the 19th century featured sinuous, S-curved blades like those found on the Balkan's and Middle-East's sword called the yataghan. Today, sword bayonets of this style are said to have "yataghan" blades, or to be "yataghan-bladed".
Both sword and spike bayonets lost their popularity after World War I. While sword bayonets can be effective as short swords, they proved to be too unwieldy in cramped quarters in trench warfare, although spike bayonets continued to be used throughout most of the 20th century. A shorter version of the sword bayonet, the knife bayonet, was developed. Today, the majority of modern bayonets are knife bayonets.
就在wiki里sword bayonet相对于 spike bayonets 的优势貌似就是易于扭转扩大创口损伤放血，在现代医学不发达的时候容易致命。

In the early 20th century spike bayonets reappeared, often folding or stowed under the barrel for compactness, such as on the French MAS-36, Chinese SKS and German FG 42. The spike bayonet was also used on the Russian Mosin–Nagant. The Lee–Enfield No.4 bayonet or Pig-Sticker, was a short spike (but fixed conventionally), and was unpopular due to its length.
@2 心机婊空灵慧

本帖真正比较对象之一， spike bayonets

另一对象，sword bayonet(分别是直刃和弯刃）

剑式刺刀说的是刺刀刀刃形状，套环式刺刀说的是刺刀座样式，两者并不冲突