As I mentioned in the above review, the Arctis Pro has a deeper, more extended subbass. So you’ll hear more low bass notes overall. The mids and treble also have a smoother, more accurate response.
The other major upgrade is the metal headband. I think the $70 or so price difference between the base Pro and the Arctis 5 is probably worth it, especially if you need the little USB surround dongle and the RGB lighting.
If you don’t need those things, and don’t mind the less bassy sound and plastic headband, then the Arctis 3 2019 is the best value choice out of the whole lineup.