Who each platform is really for
Kit19
Kit19 is generally presented as a business automation platform for Indian small and mid-sized companies, bundling lead and customer management with communication and productivity tools under one roof. That shape appeals to an owner-led business that would rather have one vendor and one login than assemble a stack. The buying question is whether the sales module is deep enough for the way your team sells, or whether it is one capable module among many.
Office24by7
Office24by7 is usually described around communication and process automation, with contact-centre style calling, messaging and workflow sitting close to the centre of the product. That shape suits a business where the volume of inbound and outbound calls is the operational reality, and where routing, logging and campaign dialling matter as much as pipeline hygiene. Again, treat this as a hypothesis for the demo rather than a settled fact, because both vendors adjust scope over time.