Atlanta is going very junior... however, since we are seeing an obscene amount of airport reserves , as well as normal home reserves in ATL to appease Delta, the amount of seniority needed to hold a decent line in ATL is actually quite high. I hold a line in DTW as a 6 month FO, my classmates who went to ATL with the same seniority flew 2-3 times last month and got stuck with almost all airport reserve in our pathetic dungeon crewroom.
All jokes aside, bid what you want. If you live in ATL, then that would be the logical choice while on reserve, to avoid having to commute to airport reserve. If 6 months go by, and you can hold a line elsewhere, then go there. Frankly, I'd like to see Pinnacle leave ATL all together, but that's up to Delta, not me.