Who each tool is really for
monday.com
monday.com is generally chosen by companies that already run work on boards and want sales to live beside projects, onboarding and delivery. It suits teams whose sales process is unusual enough to resist templates, and organisations where the same platform earns its keep across several departments rather than one.
HubSpot
HubSpot is generally chosen by companies that want the sales system to arrive with opinions already formed. Contacts, deals, lifecycle stages and campaign tooling exist as designed concepts rather than as structures you assemble. That suits teams whose pipeline comes largely from marketing and who would rather adopt good practice than invent it.