IPhone 4S. Plastic or Metal?

They say it has an Alluminium body but isn't the white or black parts, depending on the colour of course, polycarbonate plastic like the Samsung S4 or is that Alluminium too?

The reason I'm asking is because I'm not sure whether to get the Samsung Galaxy S4 or HTC One.

Added (1). I'm asking because I have an iPhone but it's time for a change.

Than why your asking abt iphone 4s?

If you don't drop your phone go with either. The 4S is hardened plastic just like the S4