I have no experience with Atlas shingles.
But you can go to the Atlas website and get some insight.
The Pinnacle Pristine includes the Scotchguard, they claim it helps prevent black streaks caused by algae.
The Briarwood Pro lacks the Scotchguard but they claim Hi-Def color, I expect the color choices in that line are "deeper".
The Castlewood also lacks the Scotchguard, not sure why it would be more "algae resistant" than any other shingle, the website doesn't seem to mention that as a feature. And it is included in their "value" line, the other two are in their "designer" line.
If algae and black streaking is common on shingles in your neighborhood, I'd be inclined to choose the Pinnacle Pristine.
If not, I'd pick according to the shingle color that I liked best. Looks to me that the most extensive color choices are in the Pinnacle Pristine line, the Briarwood Pro Hi-Def offers the fewest.
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