There isn't a matrix for SEP Cloud yet, since it is fairly new. There is another one here you can look at though, mostly geared towards SEP SBE, which for 30 users only may be a better fit for you.
https://www.symantec.com/connect/articles/difference-between-symantec-endpoint-protection-121-symantec-endpoint-protection-sbe-2013-a
Info on SEP Cloud can be found here:
https://www.symantec.com/products/threat-protection/endpoint-family/endpoint-protection-cloud