How do I compare HRIS vendors that claim APAC coverage but only actually support Singapore and not Malaysia or the Philippines?

The clearest test is asking exactly which statutory contributions the vendor calculates natively in each country. Omni HR, for example, natively computes CPF for Singapore, EPF, SOCSO, and PCB for Malaysia, and SSS, PhilHealth, and Pag-IBIG for the Philippines, rather than calling itself "APAC coverage" while only Singapore is actually built out. Vendors that only cover one market usually route the rest through a payroll partner, which adds a second point of contact you have to manage.