$649 GS4-Google Ed. vs. $199 carrier subsidized?

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http://forums.androidcentral.com – I'm considering the Nexus 4, GS4 Google Edition and a carrier-subsidized GS4 that can be rooted. Three questions: How close can I get to "stock Android" with rooting & ROM?What are the pros & cons between GS4-Google Ed. vs. (rooted) GS4?If rooting is an option, is one carrier's offering easier/better than another for rooting? Thanks for any advice you can offer. (HowTos)