Increase Subnet vs Multiple Interface IPs

So I am currently in a debate with another technician about either:

* a) adding another /24 interface + dhcp_pool to a VLAN

* b) just changing the subnet mask to /23 (which can be done as gaps were left during the design)

This is for a wired network and would not increase beyond /23, would just mean updating the netmask in DHCP (this network is almost pure dhcp, with 100 static leases and maybe 10 actual static ips on devices)

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Is there any performance reason for picking one over the other (ie broadcast traffic etc). Security is not a concern, in this case, so addressing the space separately (via /24) does not matter.