TinyBit Launcher, because it has more customizability than KISS. You can really go pixel perfect crazy there.
On other devices (for a more classic launcher experience, but with a lot of customizability) I have Neo Launcher installed.
Neither have private space support yet, though.
I tried Lawnchair builds some years ago, but had the worst experience in terms of stability and memory use, plus I seem to remember it has proprietary blobs.