The S3 fits in your pocket fine, its thinner and lighter than the 4S and there is nothing wrong with the play store, I've never had a problem with free or pay applications unless I forgot to turn wifi/mobile data on.Since we're talking samsung, I'll throw my 2 cents in.
Don't have an iphone, but I do have a google/samsung galaxy nexus phone that I use for work/testing ( http://www.google.com/nexus/#/galaxy ).
Initial impression was pretty positive. It's big, it's somewhat light and feels like plastic. It's a joy to browse on, moreso than iOS, but there is no way in hell I'm going to carry that in my pocket. The big screen sucks for that. Battery life is also pretty mediocre to bad. The first app I tried to download from Play failed, tried again - same thing. Haven't bothered to try again.
Apple products are just as buggy even really basic things like in Lion and Mountain Lion the power management settings for screen brightness don't work right. When it autodim on battery it doesn't have a static value for AC-power brightness so after a few days of taking it on and off power the screen gets dimmer and dimmer. When you shutdown the computer it auto selects reopen your windows and the shutdown at the same time and it won't deselect even if you tab if off everytime.
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