You will be travelling every week so choose the airline that you like best and ignore the ff plan in deciding. You will be so tired that you must choose the best airline or one with the best schedule. Often, this may be Delta since you are in Atlanta.

I am no longer a slave to ff programs!

Sometimes, 2 airlines will have similar schedules. If so, prioritize your airlines. You might choose Delta if you fly Delta more. You might start getting upgrades if you fly often enough.

The Alaska program is the best for infrequent travellers who don't fly enough to qualify for elite levels. With Alaska, American and Delta flights can get credit. Eventually, I plan to have only 2 ff plans, Alaska and Continental. However, for the next several years, I'll participate in several.