I'd suspect that you could put a far higher-capacity nuclear power plant in a deep well than you could extract geothermal energy from same.
Most deep-bore geothermal proposals call for many wells to be bored, on the order of dozens to hundreds. These have a limited lifespan (a few decades), and provide relatively low amounts of energy per well (perhaps tens of MW, as compared with 100s to 1,000s of MW from a nuclear reactor).
Scale and efficiency matter.
(I'm not advocating for or against either alternative here, simply noting the relative scale/effectiveness.)
Most deep-bore geothermal proposals call for many wells to be bored, on the order of dozens to hundreds. These have a limited lifespan (a few decades), and provide relatively low amounts of energy per well (perhaps tens of MW, as compared with 100s to 1,000s of MW from a nuclear reactor).
Scale and efficiency matter.
(I'm not advocating for or against either alternative here, simply noting the relative scale/effectiveness.)