Best Case Scenario: Axis Conditional Surrender against the Western Allies alone in 1943, after Calbear's Pacific War Redux utterly shafts the Japanese but the Germans are able to batter the Soviet Union badly enough that it is never able to drive the Germans off their soil. Fortunately, an Anti-Hitler coup in Germany succeeds, and is followed with a conditional surrender that screws the Soviets but leaves Germany a mostly unified democratic state with much less damage from bombing raids and other damage.
Japan's militant PM Tojo Hideki is forced to resign after presiding after terrible defeats, and Hirohito breaks his silence to demand his government sue for peace--again, with the Western Allies and not with the Soviet Union. Japan thus keeps the Kuril Islands and half of Sakhalin.
The best thing to do for the Axis Powers in WW2 is to have them lose faster, in a way that keeps more of their men alive but still discredits their evil ideas. Germany, Japan and much of the minor axis don't need Stalinist Terror or Secret Police to "learn their lesson", and a shorter war will cause them less economic hardship and losses of civilians. So, I suggest a WW2 that ends around the Spring of 1944, with the Soviets stuck at the Dnieper, Novgorod, and Murmansk. The Western Allies simply MUST return Leningrad to the Soviet Union, but the minor Eastern European Axis are spared Soviet Strongmen.
Best Case Scenario is, counter intuitively, Allied Wank 100%. I dare anyone here to suggest a better outcome for Germany, Japan, Eastern Europe and Italy than to avoid Soviet Domination, ensure integration into the NATO and later EU blocs and get aid from the Marshall Plan, have perhaps three million people still alive who would have otherwise died, and keep some of their historical (although not WW2 related) territorial positions. Germany keeps West Prussia and Japan keeps the Kurils and half of Sakhalin.