Very Mixed Reviews

I've been wanting to try new shampoos lately, in hopes of finding the best one for my very fine hair. I saw commercials for Fructis that implied it would keep your hair from breaking or falling out so much, but I know I'd heard it could be really drying to hair, so I wasn't sure if I should try it. But I've been looking at online reviews for that and the other supposedly strengthening stuff in a green bottle (Renewal 5x) and it seems like every review I've read, the people either said they loved it (often claiming it did help their hair not to break or fall out) or they hated it (sometimes claiming hair falling out or even scalp scarring O_o), so I just thought I'd ask help and opinions here before trying either brand. I'd really much rather end up on the happy, non-breaking, non-falling side than the scarring and falling out in clumps side. . .