what i've heard, I'm on my SPL atm, is that (Don't quote me, i'm probably wrong, I ADMIT IT) is that charter work is possibly the better option in one way, and instructing is the better in another way:
Charter: away from home, but gets the hours up
Instructor: near home, gets the hours up, however, possibly moved to train pilots as opposed to fly the big aircraft.. That's just what i've heard about joining airlines with instructor ratings, you can easily get purged to flying more 152's for the same salary...
could be fun though, if you still like flying 152's by then.. or Tomahawks...
(Anyone want to correct me? i'm open to suggestion)