The second plan is good.

Alternative1; Up to 4 tons can be made into milk tablets, with a profit of 8,000 yuan; The remaining 5 tons can earn 2500 yuan by selling with fresh milk. * * * profit 10500 yuan.

Option 2; Assuming that X tons of milk tablets are used, it will take 4 days to complete. When it is possible to make 4 tons of milk slices, the total profit is x * * 2000+(9-x) *1200 =14000.