Which daycare to choose?

I am looking for recommendations choosing between two daycare centers we like. Both are chains, one is a national, the other one is local to our city, both have great facilities and curriculum that we equally like. The baby will be 9-10 months when we start daycare.

Daycare A has primary caregiver for each kid, with 1:3 ratio of teachers to kids for babies up to 12mo, but all the infants are hanging out together in the same space. There are about 20 or 30 infants in total.

Daycare B also has primary caregiver for each kid, but the ratio is 1:4. On the flip side, here the kids are hanging out in groups of 8 children max. Daycare B is also ~15% more expensive.

Should we prioritize better kid:teacher ratio or smaller groups?