One of the benefits of working with a large group meet is that you'll get shots from several (sometimes dozens of) different photographers. So, you'll get photos with a wide variety of shooting, lighting, and processing styles from just one event.
Of course, that can be one of the drawbacks as well. If it's not well-organized, a large group meet turns into a paparazzi-style mess, with all the photographers clamoring over each other for the same shot.
Fortunately, my usual group is quite well run. The organizer makes groups, putting one experienced photographer with two or three less-experienced photographers and one or two models. The small groups shoot together for about an hour, then everyone is free to mingle with different photographers and models.