Personally, I think emotions would be more intuitive/easier to choose from than numbers. However, the number of emotions to choose from would have to be low (I'

Personally, I think emotions would be more intuitive/easier to choose from than numbers. However, the number of emotions to choose from would have to be low (I'd say 4 or 5). I can see why you'd want to use numbers for analysis, but you can assign a value to each emotion as well. A list/grid of emoticons would be fine for displaying the options. Nike+ does something similar to this when it gives you the option to say how you felt during a workout.