As mentioned, AMS flights will leave from T4, which means you get the T4 SkyClub. It's not bad, though the food at Wingtips is better. I'd still go with the SC, though, as it is larger, has more seating options, better views, more and better showers, more reliable internet (IME), and presumably won't cost you anything to enter. If you're at JFK for the whole afternoon, you can go grab a meal from somewhere like the Shake Shack for less than the cost of admission to Wingtips.

There are AF, AZ, and KE lounges in T1 (AF generally considered to be the best), but then there's the question of whether or not TSA will let you past the checkpoint. While the AF lounge is a bit nicer and has better food than the SC, it also gets really crowded in the afternoon, especially before the A380 departure. Not worth the hassle, IMO.