i have both in my room. YEAH MY ROOM...
the corded is next to my computer has built in caller ID, that's why i have that. it also has speaker phone =) i just needed a caller ID thing by my computer... so i got a cheap phone =)
the cordless is by my door, and has a separate caller ID thing. and i had that first... it also has speakerphone, and has a headset jack =) it's 900 MHz =)
the speakerphone is good for those LONG techsupport calls... i usually leave the speakerphone on while i am on hold, and go about my business ;-)