Yes, age old question but with a viral twist in this new age. I don't think I'd agree with the assumption that the ferry will be crowded and the plane will be empty. I haven't used the plane but most accounts I've heard had it pretty full. My gf has taken it twice and all seats filled. I've been on a few crowded ferries but usually it's a light load and you can always sit outside with a breeze to blow that virus away.
As for reliability, I'd go with bus/ferry any day. They will operate in weather that will shut down the small plane. Planes have been known to cancel for mechanical issues but never been a problem with the bus or ferry. They have enough equipment to send another bus or ferry in it's place. Also, there were rumors of the air service shutting down even before the virus. Have you confirmed if they are actually flying right now?
No, I haven’t confirmed yet. Just looked on their website and there’s not much updates there. I’ll take a better look when I’m closer to actually flying.
My impression of the ferries comes mainly from online pics I saw of it, and they have always appeared full to the brim. But it’s highly possible that that’s just for advertising! And that one other time I walked past it while strolling along 5th Avenue - also pretty crowded that time.