The main difference is usually how the product is constructed, how long it is intended to last and what job it is trying to do. Two signage products can look similar in a photo but behave very differently once they are exposed to sun, wind, cleaning, traffic or repeated handling.
If you’re deciding between two options, tell us where it is going and how long you need it for. I would rather recommend the simpler option when it is genuinely enough than overspecify the job.