Nvidia shield. All the way.
OK it's
£200 for the pro version, but I promise you, the slick remote is worth that on its own. It really does perform like the centre of your viewing experience, rather than a bolt-on device.
I finally got fed up of our PS4 as a media centre and having to fiddle with the remote, and its fast (for a game device) boot up time of about 20-30 seconds feels desperately slow for a viewing device.
The shield wakes in under a second, boots from cold in three. Switches services faster than you can blink. No exaggeration, you're in amazon or youtube, hit the netflix button and pow, you're in netflix. Go back to main menu, hit circle, you're there. Blink and you miss it.
The remote automatically backlights as you pick it up, and has a built in microphone for voice control. the voice control seamlessly works with google home (and probably axela), oh and it has a full chromecast device built in too. It can run a plex server with attached USB storage. i love it. the PS4 hasn't been switched on for months