What's the most used between them in everyday life? Thanks 
Ah ouai carrément lol. MerciC-section est plus courant. En fait je doute que la plupart de la population sache que le 'c' veut dire césarienne.
Ohlala les British décidément.. lolI think that in Britain the usage must be different. Caesarian or Caesarian section (note the spelling) are commonly used; I'd never heard of C-section before today.