What is the difference between a DECT cordless phone and a 5.8ghz cordless phone?

Would like to find out the difference between the 2 and which is more useful or better?

DECT 6.0 is a standard, rather than a frequency although one has to wonder if they just happened to choose 6.0 to start with just to trump 5.8GHz as they put the 6.0 in big numbers on the boxes and phones, furthering the myth that the higher the frequency, the better! In truth, DECT 6.0 devices run in the 1.9GHz range, near that of PCS cellular telephones. This frequency band has only very recently been approved for use in the US, while DECT phones have been in use for some time in Europe.

What makes DECT 6.0 different? Well, this new band requires devices to meet the DECT 6.0 specifications before they are approved to use the frequencies. This means NO ANALOG DEVICES. Everything DECT 6.0 is pure digital. Also, all DECT 6.0 devices by default listen before they transmit. This means NO INTERFERENCE. You buy a nice 5.8GHz DSS phone with all the bells and whistles for $200 just to have your next door neighbour buy a $10 5.8GHz analog phone from Wal-Mart interfere the heck out of it. This will never happen on DECT 6.0. DECT 6.0 devices are also permitted to use more power. This means better range. Coupled with the 1.9GHz frequency yields better coverage than 5.8GHz. DECT 6.0 phones also have the ability to use multiple handsets at once with one base (instead of multiple handsets only used one at a time), and you can associate numerous bases with one handset.