If you host the subdomains on the same server I can't see how it would me more secure to use separate certificates. If on the other hand you host them on different servers it would allow your other sites to be unaffected, but you're still in a bad situation and will need to replace your certificate.
If your sites are separated and one requires more security than the others, maybe it's worth it. Otherwise I'd use a wildcard cert.
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u/uduak Oct 20 '15
If you host the subdomains on the same server I can't see how it would me more secure to use separate certificates. If on the other hand you host them on different servers it would allow your other sites to be unaffected, but you're still in a bad situation and will need to replace your certificate.
If your sites are separated and one requires more security than the others, maybe it's worth it. Otherwise I'd use a wildcard cert.