If you’re going to dabble in room correction and convolution, I’d go with the fastest processor/number of processors combination you can get. For a NUC, it’s the i7. This is because parts of the process can be done in parallel in Roon.
However, note that if you want to do convolution on DSD files natively (not sampling to PCM) for bit rates >64, it’ll overwhelm even an i7. See my experience here.
For something as compute-intensive as this, you might go with an M1 or M2 Mac.