opks. which is best

runner76

Ive been using clearblue advanced.. I got three flashing smileys and then the solid.. I am starting to think maybe I ovulated late.. maybe it happened a day or two after the solid smiley.. I keep reading about the wondfo? opk and also regular clearblue.. I like that the advanced detects the LH surge do these others do the same, how do you know when its just surge vs actual ovulation time