I think the main differences between Atkins and Protein Power are:

atkins - divide up carbs however you want
PP - divide up carbs evenly over the day

atkins - doesn't necessarily require that you get all of your protein in
PP - must have protein at every mea

atkins - doesn't ant you to have too much protein (says it converts to glucose)
PP - isn't so concerned with an upper level of protein (although all things in moderation)

and PP starts out at a slightly higher level of carbs.

Now, to me, it makes sense that if we're trying to avoid messing with our blood sugar and insulin, we'd want things to be spread out more evenly.

That being said, sometimes, I really don't want protein at a meal (sometimes, I just want some light veggies or something). So, every once in a while, I'll skip the protein, adding it in throughout the rest of the day to make up for it.