I have only a very basic understanding of the two tools. Can you give me just some highlights regarding their differences?

Well, Ghidra's strength is batch processing at scale (which is why P-Code is less accurate than IDA's but still good enough) while allowing a massive amount of modules to execute. That allows huge distributed fleets of Ghidra. IDA has idalib now, and hcli will soon allow batch fleets, but IDA's focus is very much highly accurate analysis (for now), which makes it a lot less scalable performance wise (for now).