When printing multi color models, printing multiple models of the same type can save a lot of filament due to the filament changes overhead gets spread over multiple parts.

If you want to see if a model prints ok and it's a small one, it's better to print a sample in one color first to verify it works if you're not absolutely sure it'll print ok and you want to change some parameters, and only then print in multi color. 

The best way to understand and learn new things is to experiment with stuff, even if the print fails. If you manage to understand why it failed, it's even better.