Honestly, both are polite and correct. I would use "nice
speaking with you" over the phone and "nice speaking to you" in
person. Because over the phone your speaking with something. In
person your talking directly to someone.
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Some nice words that begin with C are:
care
caress
carnation
clean
clear
comfort
complete
cozy
cucumber
curiosity
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Outstanding is a nice word. It begins with the letter O.