I would say Situation #2 would be the better of the two options.
I don't like the 1:5 ratio however.
It will mean your baby will be doing a lot of waiting. Waiting to be fed, changed + held/rocked.
He will be crying it out often which wouldn't sit too well w/me as a mother.
Ideally Option #3:
Baby has a loving, experienced & engaged nanny who drives.
She takes him on one daily outing per day. Babies need fresh air and a change of scenery while the nanny needs to get out of the house and not stay so cooped up.
This way your child will get the best of both worlds: One-on-One individualized personal attention as well as access to daily outings w/a little diversion.
