Korea-MiG-15 and the other side of the history

[Miguel A]

According to Mr. Diego Zampini and Mr. Igor Seidov

270 Sabres were killed by VVS MiG-15
293 VVS MiG-15 were killed by Sabres (89 during Maple Special missions)

What should I believe?

6+:1 or 1,08:1 ?

Mr Zampini and Mr. Seidov had researched declassified Soviet records of that time. They have writen a book in which they explain almost each case.

I'm asking for help in this theme.

Thanks in advance.