This is not an apples to apples comparison, but its worth comparing these two cameras anyway.
Size
LX100ii wins easily
Weight
LX100ii wins easily
Pocketability
LX100ii wins hands down
Sensor
XT-30ii wins easily
Autofocus
They are very good, but the XT-30ii is more advanced for sure - it wins
Advanced Technology
XT-30ii wins easily
Lens
They are about equal. Both sharp. XT-30ii built like a tank. LX100ii lighter and smaller but very sharp
Controls
Equal - they both have shutter speed and ev compensation, and neither has ISO. LX100ii crop switch on lens is awesome. XT-30ii manual switch on front is great.
XT-30ii with its film simulations is really special. This is the one most important differentiator.
JPEG + RAW
The XT-30ii lets you shoot JPEG + RAW simultaneously which is s huge benefit. It also has several features that support RAW exposure and "ETTR" - exposing to the right.
Price
Not a good comparison. LX100ii is almost half the price of the XT-30ii.
Overall
Depending on use case they are equal. They service different needs.
If I Had to Choose One
XT-30ii