Discussion
Which device family has the higher input impedance?
Answer: A
Field effect devices win decisively: a MOSFET's gate is insulated and draws nothing, and a junction device's gate leaks only nanoamps, against a bipolar base current of microamps or more. The configuration does affect the figure, but not enough to close a gap of several orders of magnitude. That one comparison decides most choices between the families where the source is delicate.
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