Thanks for reply, but it seems that you misunderstood me.
I know what is the difference in technique between those two, but I do not know what is difference in understanding material (if there is any). I find it much easier to photoflip, and that's how I photoread, but I do not know if I'm missing much in understanding.
I find just one drawback in photofliping. Sometimes my eyes do not stay still while I'm flipping. I keep photofocus but it happens from time to time that m eyes start to follow page turning. Is that good or bad?