TK lounges offer superior food options, though their alcohol selection is limited to wine, one type of champagne, and one beer variety. Also they don't carry Coca Cola products to protest Israel. Not a huge deal but just weird since they still serve those products in their planes. The IGA lounge, while not bad in terms of food, isn’t the best choice if you have access to TK lounges. However, it does have a wider selection of liquor and more beer options.
The last time I visited, the IGA lounge was extremely crowded, with a 30-minute wait just to get in, so I decided to skip it. Overall, I still believe the IGA lounge is a solid lounge, especially compared to most lounges in the USA. That said, I’d give a slight edge to TK lounges for their superior food quality.