The one big advantage of cash games that I have noticed when I started playing them again was that there is never any pressure to play your hand when you are fully stacked with around 100BBs. You can always play as tight as you want to,
At some point in a tournament, you are often going to find out that you are short-stacked and you will feel the pressure to get all of your chips in to survive. Of course, it's not going to always be that way, but it will happen most of the time, and lots of times it happens when you are getting close to the bubble and you are being dealt a lot of junk cards.
I think it's a good idea to bring at least 2 or 3 100 BB buy-ins to a card room when you are playing cash games. It gives you an extra feeling of security.