I do not know of any reviews about the tow similar PPC programs but its all in the testing I suppose.
I am currently using both on my website. Infolinks also plays well, offering the possibility to set the max number of links you want to appear on every page (min 1 max 12). I set the total number of Infolinks in-line ads to 3 and it did not affect adsense earnings in any way. If I increase this number (also tested max 12) the adsense CTR drops a little but the Infolinks CTR and CPM increases as well as daily earnings. So, my suggestion is: adsense + max 3-5 in-line ads from Infolinks on a content-rich page is a very good choice.