which should i grow?

[Barnowl]

While I really like Cherokee Purple, I have always liked Paul Robeson much better, it is always fantastic in my garden...

As for the others, I'd go Brandywine Sudduth...

[dice]

The plants go in the ground in late March in Atlanta. What is the
right schedule for germination to get them ready for a late March planting?

General advice is to start them 6-8 weeks before they go in the ground,
regardless of when that is exactly. People who plant where the season
is very short, whether because frost comes early or because the season
is ended by summer heat, may prefer to start seeds 8-10 weeks before
transplanting and put out bigger seedlings to start with.

In exceptionally good late spring and early summer weather and good
soil, not too cold or wet or hot for tomatoes, smaller transplants tend
to catch up to larger ones in plant size before harvest.