Well, several sources from the Dark Ages show how Angle and Saxon royal units used spears as main weapons instead of seaxs, spathas or longswords.
Why? well, because the spear if properly used can have better flexibility on where to attack, since a fast thrust is far more difficult to block with a shield than a slashing attack
The problem is that we compare the level of skill of a levy using a spear with an experienced veteran using a spear. Also, the pike is far less agile than the spear, and so is the sarissa compared with a spear
We have to take in account that a spear from the Gallics tribes will be different of a spear crafted from the Germanic people, or one crafted by the greeks, as they change between lenghts and stuff.
Also, the use of longswords is very chaotic in a densed formation, as you need space to make slashing attack with enough power to cut efficiently, and they are slower too
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