We went in November, 4 nights Amandari, 5 nights Amankila.
If I could do it over, we would do 3 nights Amankila, then 6 nights Amandari.
For our second trip, as much as we liked Amankila, we're probably sticking only to Amandari and another Indonesian Aman.
There was something very magical about Amandari to us. Hard to describe. My favorite moment was trekking through the adjacent rice paddy with a flimsy flash light at night, shrieking while frogs jumped across our feet (we're city people), and then sitting down at the steps that led into the valley below. All around fireflies buzzed on and off. In the distance, the gamelan music played with the occasional gecko chirp. Absolute magic.
Also preferred the food at Amandari to Amankila. We had Suite #2 at Dari, view of the valley, and I would watch the mist rising in the evening, the sunlight growing over the canopy of the trees in the morning. When I couldn't sleep, I would open the sliding glass doors, step outside, and listen to the sounds of the jungles.