You absolutely want to go with the new hardware models at this point, the 64 & 100 will not run the latest firmware code either, so keeping it for another 5 years of virtually no updates doesn't make sense if you have the opportunity to refresh! Your current devices also are set to go end of support some time in 2027: Meraki End-of-Life (EOL) Products and Dates - Cisco Meraki Documentation
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