For the obscure architectures Ghidra does support, it's way better than IDA by virtue of having a decompiler alone. Even if the decompilation is subtly wrong, the broad strokes are so much easier to navigate that finding the right method to go through by hand is much easier.
And once you dive into Ghidra's P-Code IR and more advanced plugin support and move beyond existing IDA plugins, it's honestly better than IDA for things nobody has done before.
Now, there are some obscure architectures like C167 for which we still lack a working Ghidra processor model, but this is only a matter of time - and once it comes, it will already be way ahead of IDA!
