What are the differences between IssueCollector and ServiceDesk plugins from functionality perspective?
They are quite different.
Issue Collector is a way to embed a simple issue create form onto a webpage. That's it.
Service Desk is a full Enterprise Service Management solution. There are so many features it's hard to start describing them all. SLAs, automation, customer portal, different request types, organizations, and that's just a start. I'd suggest taking a look at these links https://www.atlassian.com/software/jira/service-desk https://confluence.atlassian.com/get-started-with-jira-service-desk/what-is-jira-service-desk-917968347.html
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