Both, for purely pragmatic reasons. I don't really care about the history of the pronunciation, I just want to be understood. So to reduce confusion, in conversations with other developers I generally just use whatever everyone else seems to be using.
If it's just me speaking, I get to choose -- in that case I start off with "Sequel", for the tiny reason that it rolls off the tongue a bit more easily (hey, it's one less syllable!).
If it's just me speaking, I get to choose -- in that case I start off with "Sequel", for the tiny reason that it rolls off the tongue a bit more easily (hey, it's one less syllable!).