Definitely a startup - you will get lots of exposure to skillsets outside of your core training. i.e. as a developer, you will be able to talk to sales people,

Definitely a startup - you will get lots of exposure to skillsets outside of your core training. i.e. as a developer, you will be able to talk to sales people, or customer support people. You will learn to talk and interact with people who think very different than you. A big company rewards extreme specialization. A startup rewards versatility.