Although my professional work experience is still limited, I have worked in both and definitely prefer startups.
At a startup, it's much easier to care about the work that you do, become recognized for the work that you do, and suggest/implement changes if something within the company isn't working well (e.g. deployment process).
Is this still possible in a large corporation? Sure. But it's usually difficult to see how your work plays a part of the bigger picture, and the process is so comfortable for many that suggesting anything new will typically become shut down.
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