I'd rather have an Android TV than Fire OS but ideally neither built in to the TV.
Sony Androids come with a horrible implementation of YouView.
LG make 1 of the best Smart TV systems with WebOS but even that can quickly become outdated.
I helped my neighbour setup an Amazon Echo yesterday. He read that Alexa can be used to control LG Tv's with voice commands so was keen to set it up.
The Alexa integration requires WebOS 4 but his TV only has WebOS 3.5
He bought the TV in the last 2 years so was surprised and disappointed to hear it wouldn't work.
Not many Smart Tv's or even dedicated streaming boxes have all the terrestrial Apps and all the big online players on a single device.
Much better getting a TV with an extra HDMI port and using an external device for streaming apps.
Fire TV, Roku, Now TV, Chromecast, Apple TV, Android boxes, and many more to choose from.
It's considerably cheaper to buy a new streaming stick/box every couple years than it is to buy a new TV with the latest smart tv features.
These sticks and boxes are also much more likely to be kept updated for longer than many Tv's.
I have a 2014 Samsung TV, just before they changed to Tizen OS.
All the main apps that came with the TV still work.
It has the main online apps, Amazon Video, Netflix, YouTube and even Plex.
It has the main terrestrial TV catch up apps, iPlayer, ITV Hub, All 4, My 5 and even has STV Player.
If I were buying a new TV now I would probably buy 1 that comes with Freeview Play. I like how you can play catch up programmes straight from the guide the same way YouView does.
I barely use any of the apps on my TV though and instead watch through my Nvidia Shield TV (Android box).
IMO the Nvidia Shield TV (2017) is the daddy of all 4k streaming boxes.
Comparison with other boxes Features and SpecificationsFrankly the specs are insane for an Android box.
VIDEO
4K HDR Ready
Up to 4K HDR playback at 60 FPS (H.265/HEVC)
Up to 4K playback at 60 FPS (VP8, VP9, H.264, MPEG1/2)
Up to 1080p playback at 60 FPS (H.263, MJPEG, MPEG4, WMV9/VC1)
Format/Container support: Xvid/ DivX/ASF/AVI/MKV/MOV/M2TS/MPEG-TS/MP4/WEB-M
AUDIO
Dolby Atmos
Pass-through
Dolby Atmos (pass-through) and DTS-X surround sound (pass-through) over HDMI
High-resolution audio playback up to 24-bit/192 kHz over HDMI and USB
High-resolution audio up-sample to 24-bit/192 kHz over USB
Audio support: AAC, AAC+, eAAC+, MP3, WAVE, AMR, OGG Vorbis, FLAC, PCM, WMA, WMA-Pro, WMA-Lossless, DD+/DTS (pass-through),
Dolby Atmos (pass-through), Dolby TrueHD (pass-through), DTS-X, and DTS-HD (pass-through)
PROCESSOR
NVIDIA Tegra X1
NVIDIA® Tegra® X1 processor with a 256-core GPU and 3 GB RAM
WIRELESS
802.11ac 2x2 MIMO 2.4 GHz and 5 GHz Wi-Fi
Bluetooth 4.1/BLE
INTERFACE
Gigabit Ethernet
HDMI 2.0b with HDCP 2.2 and CEC support
Two USB 3.0 (Type A)
OPERATING SYSTEM
Android 8.0 (Oreo) powered by Android TV™ and Chromecast™ built in
I also have a gaming PC with an Nvidia graphics cards so the Shield is ideal for using
Gamestream .