Hi
Both the greases mentioned will perform well, the Calcium Sulfonate would be our chaoice as is Over based preventing corrosion and will continue to provide good lubrication with 50-60% water inter mixed with the grease, The calcium Sulfonates are not suitable for high speed, we are a lot warmer here in Australia so look for a ISO 460 Base Oil @ an NLGI 2 rather than a #1.
SKF, Anglomoil, Mainlube carry calcium Sulfonates, here, the Mobil Exxon Grease has CaCO3 Solids, usually a light brown opaque grease.
Regards
Rob S
rttech.com.au