[bubblegum57]

EDIT: I forgot that I'm posting in an english speaking forum, lol -

Hey, I have been running Kodi on a Linux HTPC with passive cooling for more than 10 years now. Lately it needs around 10 minutes to fully boot up, so I guess it's about time to replace it. 1080p Series can't be played back stutter free, Movies can, and I really don't want to waste my days figuring out how to get everything running smoothly on this ancient box. These Android TV alternatives look very promising to me, given that you can watch Netflix and stuff on it, but I've got services like Sonarr, Radarr, SABnzbd and others running besides Kodi, which I think wouldn't run on an Android TV device, right? Do you think that an ODROID N2+ box would fit my needs, maybe even for another extended period of time, or should I rather opt to build another "real" HTPC? Or maybe an Intel NUC (if thats any better)?

Quote from above

 For 4K Netflix you need to have a Netflix-approved box, not just one that has the right Widevine level.  Netflix have a separate approval programme still I believe for their premium streams.

So an N2 would not work with Netflix. You could buy a cheapo Android box, install CE to sd card & boot from android when you want it. But the cheapo boxes are not able to deliver 4K netflix. There is a netflix addon for kodi/CE but when I last tried it, the audio was way off. 
You could buy a nas (expensive) & run sonarr etc on that, & buy a shield (not cheap) or amazon fire stick.

Hey, thanks for your reply, but maybe I was not clear enough in my question. While it would be nice to have Netflix and Kodi running on one device, it is more important for me to run the other services and Kodi on the same device. If its not possible to run linux applications on Android TV, then Android TV is a no go for me.. Though I wasn't absolutely sure if thats the case and included them in my question.

Or maybe I didn't understand you quite right, `install CE to sd card & boot from android when you want it` - CE stands for CoreELEC? - that would mean linux. Is that possible with the Amazon Fire TV box, too? Google couldn't help me ad hoc, but that would fulfill all my needs I think, if operating it isn't too tricky. 

I have a Fire TV Stick here, so the idea with a NAS running my other stuff could be a good one, too. My only concern would be that the storage might run out when having a super large library

I don't think there is one device to run everything. To have sonarr etc & kodi on one device, I think you need to build another htpc. I think qnap used to run kodi, but not anymore. You can't run linux apps on android tv. 

CE coreelec, is linux, but a cut down version, it's basically kodi, you might be able to run sonarr via kodi addons, I don't know. With CE you install it to sd card, that can then run kodi & compatible addons. You then remove the sd card & it will boot to android. 

You cannot install linux on a fire tv or shield. 

As for running out of storage, it depends on your needs. You can get 12 bay nas & 16TB hard drives. But these are expensive. A synology nas is nearly plug & play, you have packages for sonarr, etc

An advantage of a nas is the low power consumption. so a nas for storage & running the linux apps & a fire tv for playback.