The primary benefit of the doctrinal mines is that they are cheap mines that you can lay down fadt, and are available at all infantry.
I don't know if I would prefer laying down 1 enginee mine over a doctrinal mine on a chokepoint. However on an open map I would consider laying 3 special mines over 1 normal mine over open field.
The cheapo mines are also occasionally useful if your enemy likes to spam indirect fire and is blowing up your mines, and creating craters for your cobscripts to ambush from in the process.
More crucially the doctrinal mine is only triggeed by vehicles. So, use thqt if you've wiped the enrmy pioneer squad and the enemy starts sweeping mines with their squads
from the experience of the game on open maps, this mine shows itself the worst: stunning quickly, the damage is small, the tank is coming down. this mine is no more than a flash warning that on the flank someone that is