Keep in mind that if you're flying internationally in a premium cabin, you probably have access to more than one lounge. For example, if you're flying in Business on United or Singapore, you have access to both the United Club and the Singapore lounge in International-G. I like the food/drink options better in the Singapore lounge, but I think the United Club lounge in I-G is a more spacious and relaxing place. No need to choose: enjoy both!

I haven't done this in International-A, but I would imagine there is also access to multiple lounges with Sky Team and One World lounges.