I had no experience with motorcycles so I compare the physical Parameter.
Since the data capacity of the battery and charging speed are greater than with Zero, so I order an Energica Esseesse9+. A Harley is just too expensive and the data was no better. Another machine was not available / I did not find it.
If I were to buy a new electric bike, I would be deciding between the Zero SR/S Premium and the Energica SS9+ and Ribelle.
The above Zero charges twice as fast (6.x KW) on J1772 than any model of Energica and has a centerstand and frame mounted fairing. And great luggage selections.
But the Eneriga has very fast CCS charging (above 25 KW on DC but only 3.x KW on J1772). But the Energica has a reverse. AFAIK, no way to add a centerstand. And better slower speed range (not so sure about higher speeds).
And more luggage choices on the Zero SR/S. They have a very nice one all fixed up here in Reno at Eurocycles, with all the best luggage stuff. If I didn't already own ten bikes, I would have bought it.
I never trade any in. I keep all my vehicles until they are not worth repairing.
The two electric bikes I would NOT consider are the Zero SR/F and the HD livewire.
But anyway, that is me, not you. There are many models and choices for good reasons.
-Don- Reno, NV