What hours will you work, what money do you want to pay, and what is important to you?
We use a nursery as I had to go back to work FT when DD was 6 months old. We couldn't find a local childminder with space for an under-1 so our choice was between nurseries. They're all more expensive than childminders though, but tend to do more age specific activities.
If they're with a CM, they're likely to spend more time doing the school run each day and going to activities which may not be best suited to them e.g. toddler groups aimed more at the minder's slightly older children, so there is a fair bit of playing "tag along". The CMs at my DS' school also attend class assemblies to see the children they mind, but they bring along the littlies they mind as well. It's up to you whether you think this is something you'd like your baby to be doing.
Our nursery is in another village so DD will not go to school with anyone she knows from nursery, whereas a baby at a local childminder's is more likely to go to school with someone else from the CM, or children from the loca toddler group. If you have a tight commute, if the CM is near to you, geographically, it's handy to drop and run. CMs are also more likely to take children with lurgies, such as chicken pox, if they know everyone else has already had it. Nurseries will expect you to keep baby at home, which will affect your annual leave.