While certain features of these phones are comparable, like the camera. There are just certain things that you cannot compare when looking at these devices.
For instance, while the 1.2 dual core processor or 1.4 quad core processor seem to blow Apple’s .800 dual core processor out of the water, this couldnt be further from the truth. Many forget that Apple runs a different OS. Meaning that Apple’s iPhone is built specifically for their OS. They didnt need a 1.5 quad core processor because their OS does not require or utilize it. Additionally, you cant really even compare the Gnex to the S3 for the same reason. While they both run ICS, the Gnex runs a vanilla version of the OS and was made to specifically to run the OS just as the iPhone was for iOS. The S3 contains TouchWiz, which is Samsung’s bloatware and thus needs that extra power that the Gnex does not need.
All in all, there are some things you can compare but overall you cannot compare these devices by just looking at the specs. The specs are not very helpful in really telling you much about the big picture, they are simply a small piece. Each of these phones is so different that it’s going to be a matter of preference which is better, not the one that has the best specs is king.