I like Everest more too because it tells you more stuff but at least Speedfan allows you to configure your fans. But 10C difference? That's crazy man all the other temps are basically the same. Many people actually report different temps in Speedfan and Everest. Not really wondering which one is better but which one is more accurate. I guess I can always touch it with my hand.
Try it The_Mard if you want and see if there is any difference.