Wouldn't something like no camps and planning to hold off the killing until post war get lower deaths
No, it won't. Perhaps it'd mean fewer than 6 million, but it'll be more than 1.5. For these people to survive the war, they have to eat. Germany will find it increasingly difficult to feed the Wehrmacht, let alone German civilians, non-Jewish slave laborers, and prisoners of war. It only takes a few months to die of starvation, and OTL offers those few months: the winter of 1944/45. Only the Notzis can manage a Holocaust of less than 1.5 million, and it's hard to imagine how, even if there's no Barbarossa and even if they don't get the eastern half of Poland.
If, somehow, there's no Israel, the United States will certainly take the greatest number of people. The Commonwealth will probably take more than they took OTL, and France will take more as well. Other countries that accepted Jewish refugees IOTL will likely take more as well: parts of South America, and even China. That may make the political influence of the Jewish diaspora different than what we had IOTL.
Many European Jews, in Poland and elsewhere, were Zionists even before WW2. The diarists of the ghettos often mention Zionist youth groups and other organizations; for example, they considered their work on vegetable gardens in the ghettos as practice for working on kibbutzim in the Land of Israel. So, it's interesting to consider how those people might end up as equivalents of OTL's Arab Palestinians. Many would go there and live as refugees, since they have a claim to the land, in some sense, and it wouldn't be politically or morally acceptable to expel them. It's impossible to say how that would turn out. But, since there has still been a Holocaust (and I think many more than 1.5 million would have died), I think the victors of WW2 would feel obligated to give them something. It might be more of a compromise than OTL's Israel, and there might be militias instead of the IDF, and shared power instead of the Knesset. A final thought: although it did help the Entente against the Ottomans in WW1, the Arab world didn't side with the victors as much in WW2. So, if Palestine is part of Jordan or is ruled by an Arab monarchy, the US and UK may not be entirely sympathetic. (Presuming there's a Cold War, I don't think the Soviets will necessarily be very sympathetic, either.)