Don't be too hard on the lad over the "kill people" comment. No doubt said in jest.
As for Air Force, if you ask HI'er it's a sheltered workshop and the easy life so he'd say Air Force.
Seriously though, you'll do some great flying you won't get to do in civvie land regardless of what aircraft you go to off pilots course. But don't tell recruiting you want an airline job, and only tell them you want to go hornets or they won't want you.
The flying is great fun, and you'll enjoy it. You'll find what you want now is very different to what you want at 35 anyway.
Air Force = no bill and you get a million or so training whilst getting paid (or whatever the amount is up to).
G'day Aussie