I've only blogged through Crazyguyonabike. Although I haven't used it yet, I like the feature that lets you update the blog via just sending an e-mail. The first journal I wrote there was strictly via my phone, which was easier than I had originally expected it to be. My only regret about that was the only camera I had was the phone's, which was pretty dismal.
As far as reading blogs, I too really enjoy the stories about people met along the way. If the writer has a sense of humor it greatly improves the blog, especially if they are somewhat self-deprecating, and can laugh about some of the things that inevitably go wrong. I don't care for those who complain a lot or talk down about others in a general sense - such as Tansy already mentioned. But I do like to hear about specific incidents that might not be positive, just to know what others are experiencing out there. I also like to see how people handle breakdowns, and like to hear about how they are treated on the road by others.