Nvidia Shield pro. I'm using 2017 version and it's still updated regularly.
The "best" Android TV box for you depends on your budget and needs, therefore:
CERTIFIED ANDROIDTV/GOOGLETV BOXES WITH NETFLIX AND PRIME VIDEO FOR THE UNITED STATES ONLY:
- AirTV Mini (More info at airtv.net/products )
- AT&T TV (More info at att.com/tv/device-features )
- Tivo Stream 4K (More info at www.tivo.com/products/stream-4k )
- T-Mobile TVision HUB (More info at t-mobile.com/tvision/services/hub )
- Verizon Stream TV (AV1 hardware decoding. More info at verizon.com/products/verizon-stream-tv-gen-2 )
CERTIFIED ANDROIDTV/GOOGLETV BOXES WITH NETFLIX AND PRIME VIDEO FOR THE UNITED STATES, EUROPE AND THE REST OF THE WORLD:
- Chromecast with Google TV (more info at tv.google )
- Dynalink TV dongle (More info at dynalink.life )
- JBL Link Bar (More info at jbl.com/refurbished-home-speakers/JBL+LINK+BAR-.html )
- Mecool KM2 (More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
- Nokia Streaming Box 8000 (Only for Europe. More info at nokia.com/shop/streaming-devices/nokia-streaming-box-8000
- Nvidia Shield TV (The most expensive but powerful, recommended for gaming. More info at shield.nvidia.com )
CERTIFIED ANDROIDTV/GOOGLETV BOXES WITH ONLY PRIME VIDEO FOR THE UNITED STATES, EUROPE AND THE REST OF THE WORLD:
- Formuler GTV (Gigabit ethernet. Exclusive MYTVOnline2 app for IPTV. More info at formuler.tv/gtv )
- Mecool KM6 Classic Edition (AV1 hardware decoding. More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
- Mecool KM6 Deluxe Edition (AV1 hardware decoding. Gigabit ethernet. WiFi 6. 4GB of RAM. More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
- Mecool KT1 (AV1 hardware decoding. DVB-T2/S2/C tuner built-in. More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
- Mecool Now (An Android TV device with a built-in camera and microphone, suitable for videoconferencing. More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
- Mecool KD1 TV Stick (More info at mecoolonline.com where you can get a 10% off with the code "mecoolbox" at checkout)
CERTIFIED ANDROID TV BOXES WITH NETFLIX AND PRIME VIDEO CERTIFICATIONS THAT USE THE NOW OLD AMLOGIC S905X SoC:
- Xiaomi Mi Box S (More info at mi.com/global/mi-box-s )
- Ematic Jetstream (More info at androidtv-guide.com/streaming-gaming/ematic-jetstream-tv-box )
For more info about all certified Android TV devices, head over to www.androidtv-guide.com website.
There's only one answer: Shield Pro 2019.
Most of the boxes on Amazon are not Android TV boxes. They're boxes running Android that plug into your TV. If you want a cheap reliable highly updated box, choose "Chromecast with Google TV".