I am talking about the mi box tell me why.. mi box support Chromecast and also give more features.. usb port , audio port, can install some softwares baned in android.. and also have a remote.. u dnt need the phone to use it.

.. if wifi is not working can give internet via an Ethernet cable.. tel me why Chromecast is better..
you're thinking about the old "chromecast", I mentioned the new one "chromecast with google tv". I've pinned my first comment below.
mama hithuwe mi tv box eka kiyala. tv box nam "google chromecast with google tv" eka ganna. mama use karanawa. highly recommended
google chromecast with google tv is more advanced in every way to the mi box.
First thing, it's straight from the Google. it's on google's new "Android TV OS + Google TV" platform which is kind of a replacement to the android tv boxes like mi box. You can directly integrate it into google home & rest of the google ecosystem.
It has HEVC/H265 hardware level decoding, hdr10+, dolby vision even in full hd version. 4k version also available. (i don't think mi box has HEVC hardware decoding, hevc hardware decoding is crucial in my view for a streamer, actually it's better if we can have AV1 hardware decoding but afaik there're no av1 hardware decoding supported streamers yet)
It has a remote unlike old chromecast, you don't need any phone to connect to use it. it's a standalone device.
I've setup that for the my parents & they operate without any phone and extremely easy to use interface (even my parents who hates smartphones for the complexity). it has wifi, Bluetooth and all.
only downside of it compared to the mi box is lack of audio out & usb port out of the box. google tv has one usb-c input which is used to power the device + data.
so if you want to connect a device physically, have to use a external usb-c doc.
if you want to connect to net via ethernet have to buy google's power adapter with Ethernet port or usb-c hub with Ethernet port.
It's form factor is also great, it's hanging behind the TV & takes no room on table.
And the price, google tv hd version is $29 & 4k version is $39. but mi box is $79 (usa pricing).
https://store.google.com/us/product/chromecast_google_tv?hl=en-US
btw: are you sure mi box s have ethernet port? In their spec page and images I couldn't find any Ethernet ports.