OP I hated having to find a nursery, I felt guilty about leaving DD1, didn't want to leave her.
What was clear when I went to the nursery is that the babies and toddlers seemed happy, and the staff seemed to genuinely love working with children.
DDs (going from 8/9 months) loved it. The rooms were geared for them with activities and toys you wouldn't be able to have at home - and freedom to move around a baby / toddler proof environment.
After she left, DD2 used to ask to visit her friends because she enjoyed it so much. If we see the ladies from there now they still stop and chat.
It wasn't always plain sailing - I got proper mum guilt, especially when DD1 went through a phase of crying at drop off (by the time I walked past the window to get to the car she was always having a cuddle and smiling though).
And it meant they settled quickly in school because it wasn't a shock to the system.
They are now in high school / about to go to high school.
Do what is right for you. I think there is so much pressure on mums we always feel guilty (whichever choice we make). As long as they are loved and well cared for, they will be fine.