Of course, I don't have access to all the information, it's just based on what I've seen. But from what I've seen, if you want the OWP, paper is a better option. Online applicants have to wait for AOR first, and many of them seem to be waiting 4-5 months for the AOR, while paper has been getting AOR pretty quickly, and then OWP within the pre-COVID times of 3-4 months. But, unfortunately, paper won't be an option starting September 23rd, so you'd have to submit before then. If you need maintained status, the paper application is probably a better as you can't benefit from maintained status until the OWP is submitted.
We wanted the OWP so we applied on paper.