User consumption, really.

As always, the primary source remains the victors in a conflict, but especially for WWII it goes beyond simply that; it was a conflict highly charged with racial and ideological angles for the enemy combatants. Reading Axis accounts or primary Axis sources tend to occur at higher levels of education. It is not uncommon for even lower-level university students to be exposed to German "Orders of the Day" from the various army formations, Wehrmacht propaganda, and occasionally (very occasionally) the testimonial of Junior Officers.

There are of course more obvious factors such as where you are being educated, as national curriculum very much influences what focuses you take. Nothing bold or exciting in that conclusion, really.

That being said, wading into Axis histories, especially those written by primary sources...well they can be a potential shitstorm. You'll have blatant self-serving memoirs (Lost Victories by Manstein or Tigers in the Mud by Carius being two of the most prominent) or unit histories as equally biased as the Allied perspectives; such as Hubert Meyer's 12.SS HitlerJugend Series. Mr. Meyer in his life time was practically unapologetic, and was a prominent member of HIAG - a support and lobbyist group made up of former SS veterans and sympathizers. All this being said, all of the above remain deeply important works, they just require a studied eye. I never recommend to burgeoning WWII buffs to begin by reading German-biased sources first, I find it to be dangerous to young students who may have trouble separating the truth from self-service or apologia. In short its not something you try to cram into a North American teenager's mind.

That, by the way, is another thing "Allied-centric" histories have going for them; we have many works now that are decidedly not written by primary sources. Authors like Beevor have been able to provide us with far more nuanced histories that draw on ample sources and accounts from both sides without showing a disastrous bias one way or the other. Beevor's Crete details the invasion with a decided emphasis on Allied narrative, but that doesn't mean there is a dearth of German-based narrative in his book.

Another author who has managed to write from a German-centric narrative while maintaining largely an aloof, academic tone is George Nipe Jr. His detailing of the Mius river battles of 1943 in Decision in the Ukraine remains one of my top recommendations. It uses very little Soviet narrative but does neither side disservice; something approaching a miracle with the highly politically charged Eastern Front. Its heady and not at all what I would call an 'accessible' read, but its an academic-style piece meant to shatter and combat many pop history myths of the Eastern Front.

Because of where we're getting it from. Most of the accounts will be from the winners or from where you live.