I would say a common difference would be in qualified dividends. Compare line 3a. You might need to see all the Online worksheets. But you can only get those by paying for Online version or as I said you can download the .tax2021 online file for free and Open it in the Desktop program.
You know the Desktop program has a lot of features and advantages over the Online version. Like you can switch to Forms Mode and see all the forms. You can do unlimited returns and efile 5. And you can use a lower version. All the Desktop programs have the same forms, you just get more help in the higher versions.
