how would you compare the performance of your adsense link ads - against your search, image, text, etc other google adsense formats?
It's going to vary depending on site content and placement of the ads. With link ads, the visitor has to click twice before you earn anything. The best person who can tell you how they would perform on your site is you.
I agree with adpubster. The placement will tell you which performs better. If your text ads are well blended, they may perform better than your link ads. However, if your link ads are more prominent, then they will perform better. Each website has their own performance. Find out what yours is by testing different traffic and seeing what your stats show. Hope this helps.