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Well, it depends on several factors:
1- How many people will be using the restroom facilities? (If you expect a large number of people, the restroom trailers are usually a better choice.)
2- What type of location do you intend on placing the portable toilets? (If you want them situated on a lawn, for example, then you would probably NOT want a trailer sinking into it, whereas you can safely place several porta potttes on it).
3- Do you need hand washing capabilities? Even though many of the standalone portable toilets have integral sinks, the restroom trailers are designed to provide a more comfortable bathroom experience.
When in doubt, simply call the experts in New York! The #1 portable toilet company in New York is CALLAHEAD, which services New York City, Long Island, and Westchester. Their toll-free number is 1-800-634-2085, so give them a call, and they'll help you decide.
Of course, you can also peruse their website (www.CALLAHEAD.com) to see the vast number of portable toilets for every type of occasion!
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But there are many more... just check them out!