Actually think the tree that people always recommend to tree breeding novices is the Hill cherry. It has decent stats of everything(including triple sappiness of a vanilla oak) and is really easy to breed(basically just takes an oak and a birch and some random bees to get started).Indeed, just a modest amount of breeding can produce awesome results.
The White Willow as bred in a Swamp or Jungle biome provides an enormous boost in sapling productivity.
Hat tip : @Omicron
Oh, also make sure to squeeze the apples/other fruit for fruit juice to use in the fermenter. It further increases the output by 50% per sapling.
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