What kind of cordless phone gets the best outside signal?

Hi there! I found quite a few cordless phones that are able to get an excellent outside signal, and also have quite a few other amazing features as well!  

• AT&T SL82218 DECT6.0 Digital Dual Handset Answering System (Titanium and Carbonite)

    * Cordless phone system with two handsets and DECT 6.0 frequency for outstanding call clarity
    *offers greater range, clarity, and security
    * Built-in digital answering machine offers reliable and instant access to messages
    * Speakerphone built into handset for extra convenience
    * Can transfer calls between handsets; multiple handsets can be off-hook  

• Uniden TRU9485 ($40.00-$129.00)

This phone is great since it includes, various ringtones, personalize party ring, friendly menus, easily dialing, great reception, speakerphones on base, and handset as well. This is a price for such a phone!  

• Panasonic KX-TG9342T ($48.00-$232.00)

Dect 6.0 technology (which means that this phone has a wider amount of range, and will give a better signal than most phones), it also has all digital answering service, which I feel makes it easier to listen to calls, rather than to flip through them.