[Samsung Galaxy Note 9 (Exynos) ROMs, Kernels, Reco] LVArturs:
The Q3 ROM is good (soft-rebooted by itself once, but that was before a successful 10's CSC flash), but I am not so stoked on Android 10 generally. The clipboard apps are all dead, since 10 has completely stripped the right for apps to monitor the internal clipboard. CoolTool doesn't see IO, CPU, most intensive app (along with other task manager type apps that are killed - Simple System Monitor is almost completely disfunctional, I use DevCheck and 3C System Tuner Pro instead). Xposed modules mostly don't work (managed to change Bixby button to Home by editing some system settings file, though). There's no more any "kill foreground app on pressing button" in developer's settings nor in any working Xposed module. Though I didn't spend enough time in 9 to ascertain whether any of this is any different there. Then again it's early in 10's development, maybe ports and workarounds will be made.

A bit of a warning - if you just freeze all Gapps in Titanium Backup it might give weird glitches and slowness in some apps (and pesky notifications with pleas to reenable Gapps), so it's better to uninstall Play Store and its Services completely (it reinstalled itself a few times when deleted in Titanium, but after deleting in Lucky Patcher that stopped. I don't know if it was Titanium's fault or the order in which I deleted those apps.) You can also freeze Bixby and a lot of the other Samsung stuff you don't need. Though the camera app refuses to accept other gallery apps after the Samsung one is gone, so I have to open the gallery from the launcher if I want to check what I've taken - weird and slightly annoying.

Also, Lucky Patcher doesn't seem to work very well as of yet, Jasi Patcher actually works in emulating purchases and what not (with Edxposed installed).

You can use not only the Edxposed from Rom Tool - latest Riru Core works, as well as the latest Edxposed manager. Be careful with the Edxposed module itself - use either the one provided in Rom Tool or any newer CANARY versions - I use the one in attachments, but there's also a later 4497 release in Edxposed Manager's CANARY tab. If there's a bootloop (it doesn't usually bootloop, just always boots to Download Mode) due to Edxposed and related Magisk modules, boot in TWRP recovery go to Advanced-File Manager, navigate to /data/adb/modules/ and delete whichever folder you think is the problematic module. The system should be able to boot after doing that.

Xposed Edge Pro and XprivacyLua are reported working, but don't work for me - alerting that the modules aren't enabled.

Youtube Vanced worked with microG (after nuking the original and rebooting). The root versions and Magisk ones wouldn't install.

On a different note, a question - are there any players that can take advantage of the 32bit/384kHz audio capability for earphones? PowerAmp 3, both alpha and final versions, don't give even 192kHz (though one of the last alphas worked at 192kHz for Note 4, giving an audible improvement over other players), same with Neutron. JetAudio+ has a button for 192kHz output, but it doesn't provide any checks of functionality and I haven't checked by ear yet. A bit of a bummer, given that this phone has some of the best audio hardware among any ever released.