Which inventory gets into the balance sheets- opening or closing inventory?

Since it is the balance sheet, which is generally prepared at the "end" of a financial period, it would be your closing inventory that goes onto the balance sheet.

Once you have made all your adjusting entries and closing of accounts you prepare a Post Closing Trial Balance to check that all accounts remained balance. Since it is the "end" of the year and you are "closing" your books for the Fiscal Year, all adjusting entries are made, this includes taking inventory to get your closing inventory which goes onto your Post Closing Trial Balance and on your Balance Sheet.