I feel it necessary to add this link from the Wikipedia page on Marseille biographer Franz Kurowski.
My choice is now between the biographies by Heaton & Lewis or Tate. I went ahead and purchased the article by Andrew Arthy which is excellent.
"Franz Kurowski (November 17, 1923 − May 28, 2011) was a German author of fiction and non-fiction who specialised in World War II topics. He is best known for producing apologist, negationist and semi-fictional works on the history of the war, including the popular English-language series Panzer Aces and Infantry Aces."
https://en.wikipedia.org/wiki/Franz_Kurowski