What are the best walkie talkie range and what frequency type is efficient for milage?

Question

What is the best frequency type and mile range for a 8 miles radius communication?

I am looking for the best tips to allow me choose the best walkie talkie.

Does the later walkie talkie are equip with better signal?

I am look at

COBRA MICROTALK 2-WAY RADIOS Model:LI 6500

UHF/FM band for ultra-clear reception with a range up to 20 miles

22 channels combined with 121 privacy codes provide 2,662 privacy channels

Unique battery-saver circuit, roger-beep, 10 call alerts, and key lock

Answer 1

Honestly, none of those radios will get you 8 miles.  They may be advertised to do so, but they won't work.

Also a license is required for the GMRS channels.