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For the next tier shift both look like appealing options if they drop to ZU.
Claydol would be a great hazard control mon that has access to both Stealth Rock and Rapid Spin. Beating Golem is a huge plus but it would struggle against some other metagame staples such as Rotom-Frost and Kecleon.
Golurk on the other hand is more of an offensive behemoth that has enough power and coverage to threaten most of the metagame, notably being able to beat the Mareanie + Bronzor core. Unfortunately it would struggle against several offensive mons due to its poor speed and defensive typing.