[1.10.2] What are the differences between this 3 methods?

From the World class:

    public void scheduleUpdate(BlockPos pos, Block blockIn, int delay)

    {

    }

 

    public void updateBlockTick(BlockPos pos, Block blockIn, int delay, int priority)

    {

    }

 

    public void scheduleBlockUpdate(BlockPos pos, Block blockIn, int delay, int priority)

    {

    }

And what would be the best one to apply periodically if I want a crop/sappling or Reeds/Cactus to grow faster?

Thanks a lot.