For me the best way to control the Alarm in regards to dismissing or snoozing
is gestures&accelerometer. This feels more natural when you are waking up in
bed than searching blindly for correct (drawn)button to press. Thus the buttons
design and placement will be irelevant.
Below are some scenarios:

1.Tap screen once - snooze.
2.Double tap screen - dismiss.

OR

1.Swipe screen across short side - snooze.
2.Swipe screen long side - dismiss.

OR

1.Pick device up - snooze
2.Turn device face down - dismiss.

Any combination of above will do it as well.