[G4 Q&A, Help & Troubleshooting] shiboby:
I got a private message that really helped me a lot from Zilol. I'm posting it here for others who may be considering the same thing, with Zilol's permission of course;)

I would choose the G4 if it was overall experience and stability. But root and everything about KDZ is horrible if u are used to nexus-like devices, the G4 is way more trouble and all about being careful and a lot of more work as well. TWRP got erased and if u boot into recovery (stock), it automatically does a factory reset with wiping media too (I didnt know neither of those 2 factors) and I lost my internal storage. I was so mad, I gave the 1+2 a shot. Well, compared to the G4 the 1+2 feels like a unfinished buisness. The battery life isnt really above average. I would guess the SD810 to be the culprit but thats not the case. Its something about standby time, not OST but I guess that could be fixed by a software update. OxygenOS feels like an unfinished buisness, lacking several important features and a certain degree of stability. When I updated to 2.0.2, I lost the search bar in "recents" and "clear all apps" was gone as well, which just makes no sense, since u dont have an option to activate it, at least I didnt found it. The next thing is camera. On short distance its fine and compareable to the G4 but under low lights its another story. the photos arent as sharp as on the G4 when zoomed in but that could be the difference in megapixel count. but the biggest problem (just discovered like 2 mins ago) its just bad when it comes to distance shots. Because the infinite focus doesnt seem to work. When I manually focus, there is a short period where its sharp but when the focus is fixated its not sharp at all. I like in the 27th floor with a whole city to my feet and the picture quality differences speaks for themselves, especially at low light. otherwise the 1+2 cam is fine but not to take picture in the distance properly is an issue, maybe it will get fixed through an update.

I recommend the G4. I like stock android but in my opinion the LG UX was good to go. Its really not that much of a big deal. The cam is great, the battery life fair and u can swap battery and expand storage. The 1+2 does better at flashing and u dont loose warranty through BL unlock, only time will tell. Once they fix fingerprint for CM roms or until M is out and FP becomes native, I cant recommend 1+2 over G4. Or atleast they have to update oxygenos bc the current state is problematic, maybe CM roms are better but right now they lack laser-autofocus and fingerprint so thats a no-go for me. On the other hand OOS 2.1 will be out by the mid of the month, so maybe its worth the wait since its a 2.1 bigger update. Im positive 1+ will give their best but at the end of the day only real life performance counts even if they put much effort in it.

When it comes to build quali I prefer the 1+2 over the G4. The leather back is awesome but the chrome finish on the sides isnt my thing. both feel really good in the hand tho but the alu sides of the 1+2 makes it feel more premium. If u choose the 1+2 btw, be aware of the style swap covers. I bought it in china in the experience store, so Im talking about oem accessories. I bought the rosewood and kevlar back but they are thicker and make the phone more bulky. The standard sandstone covers finishes with the alu sides but the others stand out a little bit. Could be an aestethic problem.