Activity Level & Logging. Opinions plz!!

Hey! I haven't been back here in a while, but I've decided to try and lose the weight I gained while away. 

Just wondering you're opinions on something:
is it better(more accurate) to leave my activity level at Sedentary & log everything I do (including sitting in class 6hrs a day 5days a week) -- or to set my activity level to light when I really don't do that much outside of.. well, sit in class during the week.  

There is quite the difference in what I burn doing it one way over the other, I actually burn MORE when I just add in all my activities which therefore allows me to eat a much better amount then I have been by leaving it on 'lightly active'.

You burn the same amount regardless of how you log.  Your actual burn doesn't change with your estimate.  Pick one and see how you lose weight over time.  If it seems accurate enough, keep it; if not, change it.

What I do is leave it at sedentary and then log the purposeful excercise I do. Aka at the gym, out on my bike, walking/running for excercise reasons.

I do not log: sitting at my desk, cleaning, home renos, playing with the cats/kids, climbing the stairs. Why? Because that's a normal part of my life.

Sedentary means you literally sit all day (does not include walking to and from class, preparing food, basically moving in anyway). In my opinion, it is more accurate to mark as "light" and then add, as wtfrail put, purposeful activities (those which involve sweat and can be classified as exercise).