Hi Starsunshine!
I was beside myself about going back to work, in fact I spent the last weeks of my maternity leave in a right state about it! When it came to it, it honestly wasn't nearly as bad as I feared. I also went back right at the end of the summer term and it was great as I knew I only had a few weeks to go until the summer holidays. September was harder as I knew it was for good, but it was fine once I got into a routine.
We opted for a childminder for Abigail as she was still quite young (6 months old) and I wanted her to be in a more 'homey' environment rather than anywhere too big or too structured. It worked great for us; the older kids loved her and she settled in really well there. However after the first 6 months or so the childminder stopped working as she and her husband took over a pub. We were really gutted, and we couldn't find another one we liked as much, so since then we have put Abigail in nursery. It is a small and informal nusery, very friendly and they do loads of crafts, cooking, gardeing etc, so she has a great time there. I think on refelction she would have been fine there from the start, but I felt happier having her somewhere more like home at first.
I think there are advantages and disadvantages to both. Obvioulsy if the childminder is ill then you have an emergency childcare problem on your hands, whereas with nursery they will always be able to take them. With a childminder I liked the fact that they went out a lot, and that she mixed with children of different ages.
Having said that, I think the play and activities are more structured at nursery, and I feel that she's come on a lot in her development since she's been there.
At the end of the day, I would go with your gut feeling and pick the one that just feels right, as if you are happy and settled leaving him there then he is likely to pick up on that. Also make sure they do some settling in sessions before you go back to work - and make sure you have LOTS to do the first few times you leave him there - I felt like I was ripping my heart out leaving her the first few times, but it really does get easier!