pi 3B+, 4, 5

[the_bertrum]

Yes, it has been asked before, and the answer is "it depends". Zero if you need the form factor, 3a is good if slightly smaller is desirable, 3b is more than enough to run moOde perfectly well, 4 gives more headroom for faster scans and more DSP processing if you need that but uses more power/runs hotter, 5 adds even more bells at the cost of more power/heat. 512 is plenty memory.