Personally speaking, I prefer to keep my RPs at as realistic a pace as possible. People change, yes, but usually that change isn't during the course of a week. Therefore, I like having a mixture. Too much plot and everything feels so rushed and forced. Too little and people lose interest. If I feel like we've been in one spot too long, then I'll do something to push us out of it. *looks at TFA and the random fires*
Although, I have to say, I do prefer character development over plot. Mainly because, for the most part, plot is predictable. People aren't.