Do you prefer to focus on building blogs or websites? My goal is to build a series of niche sites, but I wonder what will be easiest to manage when I have build about 40-50 sites, blogs or websites? Is it better to build sites in general areas or around specific products?

I personally use blogs, but I think websites are a bit easier because people aren´t expecting daily updates! Once you have a massive network, like you are talking about, it is going to be very difficult to regularily post new articles on blogs, unless you hire someone to do it for you or use free content. Websites take longer to actually set up, but I think they are less work in the long run. However if you want lots of repeat traffic, blogs are the way to go! Hope that helps.

I prefer building websites as it get more pleasure out of constructing something totally mine! Blogs are alot more boring and require you to write lots of boring material. Websites are they way forward!!

Websites are definitely more fun to build than blogs, and not to mention, blogs can be a pain to update often. Sites don't require much updating...

Either can be good. The thing with blogs is that updates really need to be several times a week for your blog to have any kind of real following.

I prefer using blogs because they can be set up at the minimum time. I have already tried to make a personal website, but had abandoned it because it takes too long.

If you're making a tonne of niche sites (like the 40-50 you mentioned) then I would also agree that blogs really are the way to go. Like chocoguy mentioned, just the start-up time alone is so fast that it can save you a lot of work messing around with coding and managing your .html files on a host.