Screen protectors are kind of like cases and everybody has their own likes and dislikes but I prefer the tempered glass ones myself. I've used many different brands with previous phones. Currently I have an Amplim tempered glass on my 6+, got it from Amazon for about $9. It's not edge to edge because of the phones curved screen but it fits well, the cutouts are precise, the edges are rounded, it's perfectly clear, has an oleo phobic coating and feels very smooth. Put one on my wife's 6 and several of my friends bought them too, all have been perfect. Very happy with it and it works with all the cases that I have tried so far.