We started with nursery and swapped to nanny.
With a nanny, the baby didn't have to be ready when she arrived, we never had to pack a nursery bag and in fact some mornings, I handed over and then went to put on my makeup and work clothes if we had had a late start, a rough night or a clingy morning.
I saved around 30 minutes in the morning and in the evening by handing over at my house rather than dropping off and picking up at nursery. Picking up a tired baby at 6pm often lead to quite a hideous drive home and fractious evening whereas arriving home to a tired baby who was often fed, washed and in his pj's was much nicer all round.
This was crucial.. leaving the house at 7:45 meant I could be at my desk by 8:30 and I could leave the office at 5:45 and be home by 6:30. In the nursery scenario I was rushing in at 9 and flying out the door at 5:15 and constantly stressed.
When DS was ill, the nanny looked after him and I didn't spend the day anxious that the phone would ring. Also she handled his illnesses like I would have done, not requiring GP prescriptions for over the counter medicines for example plus the huge bonus was that he was poorly less often when not at nursery. His routine was adhered to in a way nursery promised but never quite managed.
He had loads of friends, time in the park and lots of time at home. Our nanny was a competant lady and adhered to his strict allergy diet in a way that nursery were not able to and dealt with his washable nappies without a grumble and at times, took him to appointments that did not require me to be there.
The downsides are the costs, nanny salary including tax, extra food costs, activities and we probably spent more on toys and craft at home but she was great at doing good this too.
It changed our lives for the better but the cost impact was significant. 70 per day for nursery compared to 150 for a nanny. We split drop offs and pick ups between DH and I so each of us could stay late two days a week and I worked three hours from home on Fridays which both the nanny and work agreed to.