Most of the main manufacturers of vacuum cleaners also produce a range of heavy duty or trade versions of their popular cleaners and some of these also produce industrially rated and special purpose cleaners.
A few manufacturers only produce heavy duty types.
Numatic is a very popular supplier of these types and have gained a good reputation over several decades. I have used a heavy duty version of their popular "Henry" cleaner that is still going strong after 30 - odd years.
Numatic produce, in addition to the usual types, a range of hazardous dust vacuums.
Clearly the best choice of cleaner will be one that either does not break down or is one that can be repaired quickly and easily by a local company.
I suggest you approach local companies to discover what they use and their satisfaction with the brand - large hotels for instance.
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