If it were me I skip the other two and go with the Clark.
24 volt is an obsolete voltage on sit down forklift trucks. 36 volt is strictly a North American voltage and not used in other parts of the world.
You should be able to get the Clark in either 36 volt or 48 volt. The advantage of the higher voltage is faster travel and lift speeds. If you have long runs and need a triple mast with 189" of lift or higher then I would recommend 48 volt. Assuming that you get the biggest battery that will fit in the compartment with matching charger then the 36 volt and 48 volt battery and charger package price is almost identical.
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