Hmm. Well, nowadays, I don't have--or go by--a specific word count; I seem to be able to write more when there's an official deadline, (like for submitting poetry or a short story to a literary journal or an anthology), rather than a deadline I try to set myself. When I tried NanoWirmo, I wasn't able to reach the average, daily word count I'd need in order to reach 50,000 words by the end of the month.
Some days, I did manage to reach my own smaller word count goal of, say, 500 words, and even exceed that, but when I wouldn't reach the goal the next day or the one after that, I'd suddenly be so panicked about having to write a lot more in order to "catch up to the word count I should've reached by now," that it hindered me from writing and coming up with creative ideas.
I like the idea of having a goal of writing one chapter at a time; when I focused on writing and rewriting one chapter, I felt happy with what I'd accomplished, and not overwhelmed. It helped inspire me to want to continue on to writing the next chapter, whereas, having a specific word count deadline each day, just panicked and overwhelmed me so much that I wasn't able to get much done.
So, perhaps, if you're asking for help on choosing a certain method, it's possible that you might need to try out a couple or a few, to find one or two that suit you best.