Replying to Advice for a PhoneTard

My 7 year old "eco" Samsung flip phone is about to bite the dust.

I don't know much about smartphones but after a little recon, I think I have it narrowed down to:
1. Iphone
2. Sony Xperia
3. Samsung Galaxy S3

I have a mac and that's really the only reason I'm interested in the iphone (and the dimensions seem smaller than anything else). Between mtn biking and my job which is a lot of field work, my electronics get beaten up and I want a phone that won't have the screen break if it falls out of my pocket on occasion. I hate how large most smart phones are, especially once you put a case on them to "protect them". Also interested in having a nice camera on it as well and battery life.

Which would you choose? Is there something else that I should look at?