Off the top of my head, pros and cons as follow - this could be a thread on its own and for growers in Zone 8 or colder.
Potted Figs - Pros
- Can ripen most varieties
- Can headstart with a makeshift grow area
- Varieties will ripen +/- 1-2 weeks earlier than inground
- Can pack trees into a central location and move around as needed
Potted Figs - Cons
- Have to water every day all Summer long
- Have to lug pots to and from garage or shelter for protection
- Have to root prune every few years
- Have to fertilize every few weeks
Inground Trees - Pros
- Can get a larger tree and harvest and with better quality (anecdotal)
- Only have to water during drought
- Only have to fertilize if you want (compost is usually sufficient)
Inground Trees - Cons
- Have to protect in Winter (not a huge ordeal, but something to consider)
- Limited in varieties (anything late ripening +/- 110 days and you won’t get full crop)
You should be able to ripen a lot up on Long Island if you plant inground. I’m in Zone 7b South Jersey and only have two later ripening figs in pots, with the rest inground. You may opt for a similar situation.