Hi Weesaidie
How old is your dd?
I have used both nursery and a c/m, and there are advantages and disadvantages to both, as with everything. However, now my dds both go to a c/m (dd1 now only after school) and I'm really happy with the situation.
I think you're right that a c/m will be more flexible. Mine is great if things crop up at work and I need to, say, drop them off to her before school rather than the usual situation where I take dd1 to school and she collects her. Also, for example, one time my car broke down and I phoned her in a panic to say I was waiting on the RAC and had no idea what time I'd be arriving to collect the girls and it was no big deal, all she said was 'shall I give them some tea?', which was fab! (Obviously I paid her for the extra time, but the main thing was that no fuss was made and I knew that the girls weren't going to be freaked out by it.)
Can't really comment on costs. I found a c/m cheaper, but we moved from a nursery in the South East to a c/m in Yorkshire, so the change of area might have accounted for some of the difference in cost.
If you are worried about your dd interacting with other children of her own age, you need to find a c/m who will take her to toddlers' groups, etc. That way they get the best of both worlds.
Another advantage of a c/m is food-related. My dd1 was an incredibly fussy eater (seems to have grown out of it now) and with a c/m I knew that she'd watch what she was eating and make sure that she ate SOMETHING, and that she was getting things that were reasonably healthy. At nursery I was a bit worried that she was not eating any lunch and just filling up on biscuits at snack time. (Obviously this is different for a baby, when you'd tend to provide your own food anyway.)
Be prepared to spend a LONG time phoning round c/ms to find someone who can take your dd at the times you need and who you like the sound of. I spent days on the phone trying to narrow down my possibilities (mind you, I was trying to find someone who could take two children full-time initially, so that was harder...). As soon as I met my c/m I knew she'd be great. I think it's one of those 'gut feeling' things. I wouldn't have gone with anyone who didn't 'feel right', even if I couldn't put my finger on why...
Good luck, and congratulations on going to Uni.