I do think it depends on platform too. I'm on Tumblr and thus follow other Simblrs. It's kind of a common thing to chop things up in tiny bits so you have a steady queue of several posts a day, even if you don't play/write for while.
Personally I prefer not too much text in each post. I usually don't have time to read it. I prefer clear pictures with vibrant colours - if people over-edit or use certain reshade presets, it often doesn't draw me in. I don't like to ready stories that are too dramatic or basically are a soap opera. I don't mind a bit of drama, but with a realistic touch, or a supernatural one. I prefer it to be varied with happy and mundane moments. As much as I admire and appreciate bloggers who take the effort to write actual stories, I often prefer the ones that post gameplay with simple comments. One thing I really dislike are stories that skip so much and assume that you understand what happened in the meantime, even if no hints are given. I'd rather have a little too much exposition than read a story that doesn't make sense to me.
As for my own blog, I usually post gameplay pictures with my rather dry commentary. I have done dialogue based "stories", but I simply don't have the time or energy to do all that anymore. I do still make exceptions for holiday themed stories, like Simblreen and Christmas. Then I like to come up with more plot driven stories and even pose my Sims and write dialogue. Although last Simblreen, I did a set of pictures with more text, a sort of backstory album for multiple Sims.
In between of stories/gameplay I also showcase stuff I upload to the gallery.
