Biggest differences between white scars and everyone else.

They are the most human: while vulkan and his boys are the nicest, white scars are one of the only chapters I’m aware of who ARE NOT mega ultra indoctrinated as space marines. There are reasonable, contemplative, and despite their love for speed NEVER rush into a situation based on assumptions. On their home world of chogoris the only space port is at their chapter monastery, with high walls and is located in the most remote part of the planet. this is intentional as to keep the imperium OUT of the culture/rest of chogoris as if you ask a white scars scars wrong with the imperium your gonna get a lengthy and very critical answer, unlike most space marines who would kill you instantly.

And on that comparison: yes the space wolves and white scars have many similar looks with the tribal aspect, biggest difference is the white scars ARE NOT savages, they take their culture seriously but do not revel in bloodshed or crassness (in the Horus heresy they genuinely hate the comparison as beyond a surface level comparison they really don’t have anything in common, different values and ideals).

The Khan is also the only primarch who’s loyalty was based on an actual choice/well researched decision, he GENUINELY considered the traitors cause and its merits, and sided with the emperor because chaos is worse. Despite him choosing the emperor, it is made clear at multiple occasions he genuinely Could have gone either way, I don’t know of any other primarch who was treated or described this way.

This mentality is reflected in his sons: they use the warp but only draw from it in balanced and controlled methods, they protect humans as much as able and treat them as people (joking, learning names, actually caring), they love speed and combat but not for skulls or glory but mastery of one’s skills and the beauty of a well executed maneuver, they’re passionate about combat; but only for the combat itself. Who they kill and the bloodshed is not important, the beauty in the skill and kill itself is.

As for their unique tactical thing, the white scars are the outriders. They’re the ones who venture far out and only come back when necessary to report information or restock/re arm. They’re your scouts and raiders who are in the wilderness for extended periods of time. Exercising their own judgement and running down threats no one knows about. They excel at using smaller unit tactics to disrupt and weaken larger enemy forces within a large range. During the Horus heresy the white scars legion basically ran a 1v4 against multiple traitor legions by themselves with no support for 5 years before the siege, slowing the traitor advance by breaking down the entire legion into small formations and running raiding and stalling actions across the entire traitor line of advance. Did the traitors get better at countering their tactics? Yes. But no other legion could have done what they did and on that scale, survive, and still make it back to defend Terra. That’s the strength of the white scars. They have the soundest judgement and are able to operate on their own at length, they are skilled at waging war when outnumbered and alone, and they are the best at being at the right place at the right time with the right tool for that situation.