I recently listened to my Zu Druids alongside Zu Omen speakers which weren't broken in yet, and found that the tonal shift in direction of the sound was such that the Omens were a little more in the direction of being slightly clearer and more airy with a little more bass than the Druids, and that the Zu Druids had a slightly warmer more 'tubey' sound overall compared to the Omens.
Which is better on balance of course will depend on personal preference and other system components bias. And naturally, the already close gap in the sound between the two will probably narrow as the Omen speakers break in and warm up. Reports are that the sound of the Omen's changes dramatically as they break in. However, I feel (and don't know for sure) that some of the differences in sound between the two just mentioned, however slight, will remain.