Wireless Joint

Is there such thing as a "Best" router on the market?

Yes. Best router is the best u can afford.

What kind of router are we talking about? LTE router or a conventional router to use as a WiFi access?

Would look at T-Mobile before you get too crazy with hardware.

Depending on your location you can spend much more on antennas and cabling.

Verizon AT&T also have a home solution. There also Starlink maybe this year??

https://www.t-mobile.com/isp

For plug and play , works with carriers on their data only plans? I would say Peplink has been really pushing the bar for the new 5G stuff and getting acceptance from T-mobile lately on their 5G data only plans.

For customized diy routers. It's all subjective and still pretty wild west.