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OK, so you want balanced output like this? I didn't think that would be useful for a sample and hold circuit.
Anyway, I think both circuits can have the same speed. Implementation of cmfb will be different though, so a lot depends on the first stage.
---------- Post added at 08:08 ---------- Previous post was at 08:06 ----------
With the limited info u give about vbn both circuits r the same although the left having -vbn allows u to get tri-state action