I think you'll find a host of parents on here in favor of open adoption. There are a lot of opinions that it's better for the child to be in an open adoption.
I always recommend that you be open to all the possible options, and then in the end, you need to do what feels right for your family. Not every adoption is open and really the term OPEN is very broad. Each family and birth family decide what level of openness works for them. Some feel like part of each others families and do the vacations or a lot of visitations etc. Some do not. Some maybe visit once a year and exchange letters/pics. There are also semi open arrangements, where you might never visit, but the lines of communication remain open. Maybe you'll exchange 4 updates/pictures a year etc. Whatever the arrangement people make is because that arrangement works for them personally.
I think too, you have to remember, that even as big as the membership here on the site is, it's still a small number representing the adoption community as a whole.
I really believe that there are people all over the nation that fit each type of comfort level in how open or closed their adoption is. So learn all you can, take what you can get from the suggestions, and in the end, you do what you are comfortable with.
I entered into a closed adoption because that was what I wanted. The thought of an open adoption terrified me, because at the time, I thought it meant "co-parenting" and I certainly did not want that. I've learned a lot since those early days though, and realize that I had been misinformed on a lot of things. I've learned that everyone makes the arrangement that works best for them and just because Sally has a completely open arrangement where they vacation once a year, does not mean that Joe does. etc. There are no set rules in this world of adoption.
And one of the cons of closed adoptions (at least in my experience) is that I have a lot of questions about my kids' bfamily. I can't answer my 5 year old's question of what he was like as a baby. I can't confirm with my 8 year old dd that her blonde hair will stay blonde through out her life. I have very little medical information, and sometimes that really scares me. If I had contact with the bfamily, I could answer these questions. Does it mean that I'd want to vacation with them? No, not necessarily.
So again, learn what you can and don't be afraid to do what feels right for you and your family. I think it's very possible to enter into something doing what feels best for you while still respecting and honoring others, including the child. And you never know...you might change your mind at some point during the process so allow the door to remain open to possible changes.
Best of luck to you.
Crick