When a company asks an european bank for a financing deal (e.g. to construct a Floater, an Interest Rate Option, etc.):

• Which interest reference rate do european banks use mostly nowadays to finance corporations, LIBOR or EURIBOR?
• Why ist the one preferred over the other?
• In which circumstances or under which conditions does a bank apply the EURIBOR istead of the LIBOR, et vice-versa?