I haven't tried the Arai, but here are a few observations on the Hornet.
There are very few visor options compared to the Arai. I found it impossible to source a dark visor and had to get a tinted visor then fit the darkest pinlock which in fairness was a good enough solution.
The peak on my Hornet vibrates a little too, like the Arai, but I did what many here recommend and stuck a couple of wee adhesive lead weights on the under side of the peak which smooths out the vibes nicely.
Apart from that I really like the Hornet and after just over three years use am still very happy with it.