All versions of TurboTax Desktop have the same forms and worksheet availability through Forms Mode. The differences are between the step-by-step guidance they provide. None of the versions are going to give you any step-by-step guidance on how to enter information from Form 8621, so it doesn't matter which version you use for that. You can always start in Basic, and the do an in-program upgrade if you want additional step-by-step instructions/guidance.
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