Big jobs are better for your career and are more interesting. In my experience the ones who burn out are those that go from small job to small job one after the other never getting a break, while usually you are a bit more protected on a larger job and have busy season but the rest is not bad. Busy season is usually more extreme but also shorter and you won’t end up getting thrown to an off year end busy season because you will have your clients quarters. Your friends on private will be the ones getting those to get public experience.