In today's world I always try not to let people see obviously that I am carrying a laptop around because of so many thefts and break in into our cars so I am more to laptop backpack than laptop carrying cases even though the latter look more elegant and give us that coporate look. Thus in terms of safety I choose laptop backpack instead of laptop carrying cases. I got myself a black BooqPaq3 which I haven't regretted buying after 3 years !!
Pros : It serves all the purpose of carrying my laptop around discrimately. It protects my laptop with ample paddings . It has lots of pockets for my CD, handy drives, power cords, mouse and even my MP3. It is made of very tough, dirt, stain and weather resistant ballistic nylon hence it is very suitable for travelling. It comes with many zippers so we can put our electronics inside without the fear of accidentally falling out.
Cons : None that i can think of.