The issue with Trellis is that there are a lot of liveaboards, so finding a good ball or anchoring spot is not always easy. Marina Cay, to me, seems to have more space available.

That said, I hate the trip to Trellis at night, even in a 17' boat. What is an easy ride in daylight becomes very different after dark, particularly if the wind picks up or it starts raining. You also have the problem of finding dock space, which can become highly competitive.

If you want a worry-free evening, taking the ferry from Scrub is the way to go.