Difference community/subscription rules

Hi,

I am currently doing an internship and I am working on embedding Snort in a software to detect vulnerabilities in fabric's network (OT environment). I have talked to someone who recommend me to use Cisco Talos rules, so a subscription set of rules. Due to fact it is non free I would like to know what the difference between community and subscription rules is in term of content, number of rules, using context, etc.

I do not know if it is the correct place to ask my question, but I was not able to find any other contact information.
Any help would be very appreciated, thank you in advance.

Best regards

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