I just want a screen protector to prevent scratches...
Does a anti fingerprint screen protector work?
Both prevent scratches.
A matte screen protector genrally contains anti finger print properties and has a very smooth feel to it, meaning sliding your finger across the screen causes barely no friction. The downside to matte screen protectors are that they create a pixelated effect which is quite visible, it is nearly like making your iphone non retina. Every matte screen protector is different and the best ones only take away from the screen clarity by a bit.
Clear screen protectors feel very similar to an iPhone screen without any screen protector on, as in the screen is not smooth. There is friction when rubbing the screen. Although the advantage of a clear scree protector is that it does not take away from the retina at all and allows the iphone 5 to have its natural vibrant display.
The one I have is a mixture of both and is the best imo but is only done by spigen I think, meaning its out of the equation for you unless you want to pay very high shipping costs.