I think it's a form over function decision. Outside of the fingerprint sensor, I think the G4 has more function but less form compared to the S6. The G4 is utilitarian. The curve does make it more comfortable to hold (compared to the G3 and S6) but the S6 is the looker of the two.
I played with both in the store and went with the G4. For one, I had a G3 and love the screen size. Secondly, I'm spoiled by the pop out battery and extra SD storage. Lastly, the S6 costs more. However, on aesthetics, the S6 is awesome and that screen is brilliant. T-Mo's S6 edge 64GB was $799. G4 was $599 plus a free spare battery and 128GB card. So my decision was easy! Sorry for the length!
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