Now this is one funny wise decision again. 
How many times were you hacked? Do you know why you are hacked? Have you ever try to consider that it was your fault because of being careless?

You are risking it more with exchanges. Anytime they can close down and that is when you say goodbye to all your coins without a fight.
Unlike with wallets you are the one keeping it safe. You will just have to be careful with attacks and websites that you are going at.