One week of guitar is just a fraction of a blink of the eye. Give yourself time for your fingers to stretch and your body to lose some of it's beginner's tension. Either fingering is fine. Your fingering depends on which chord your going to next and how easy it is to get there from what you are doing on the previous chord.
Make sure your thumb is at least in the middle of the neck behind the fretboard. Keep your elbow tucked in to your side and angle the neck sightly up and out from your chest. This makes an easier angle for your wrist. Cross your legs to that the guitar is sitting higher if you are not already doing that. In a couple of weeks or more most of the open chords will fall into place. Stick with it and be patient. We all had to go through this stage.
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