Why like KZ so much ? They don't sound smooth at all.
You want good IEM at least start with a Moondrop Starfield.
Or if you want big bass but less detail, then TRN IM2

Wireless you have alot of things to consider.
WHich type of wireless headphone you want ? Some is neckband type , some is true wireless (TWS)
You need AptX support ? If you are planning to pair it with a Snapdragon powered CPU, then it is good to have this.
You need Active Noise Cancellation ?
Do you listen at very loud volume ?
Do you require to make calls often ? Because TWS has mic , so call quality might matter .

See your budget also. If you got truck loads of money, then get Sony WF-1000XM3 . Best all rounder.

Well you should ask in audiophile section.