I have not benchmarked it, but they should be the same if they have the same functionality. Why should they be different?
OTOH, flat sequences are much faster and easier to program and debug, because they don't hide code and don't have clumsy sequence locals. That's the time that really counts!
🙂Stacked sequences should be discouraged. If you think you
really need a stacked sequence, use a case structure in a state machine type topology instead.
🙂