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Do routing instances and logical systems have different use cases?
For example, what would be the difference in use cases between a routing instance (of type virtual-router) and a logical system. When would I use one instead of the other?
Please google your question, the topic is so much discussable. https://community.juniper.net/discussion/difference-between-logical-router-and-virtual-router
So, long story short, in logical system you completely dedicate some interfaces or other resources to it. Therefore, each logical system is independent and managed separately. While routing instance is a separate RIB (either L2 or L3). Depending on the resource of the platform, you can deploy several logical systems and run them as independent routers, interconnect and so on.
Check this for more details - https://www.juniper.net/documentation/us/en/software/junos/logical-systems/topics/topic-map/security-logical-systems-for-routers-and-switches.html