You can feed either one. Just watch for classic signs of cocci and treat with Corid (concentrated Amprolium) for a week. Here is a good article on cocci.
http://www.cornerstone-farm.com/dealing_with_coccidiosis.htm
No it is NOT an antibiotic, it is a thiamine blocker, completely safe. The problem is that even when I feed medicated starter, mine still get cocci. I think they've lowered the dosage or its just not as effective anymore. You can feed medicated till they start to lay.