I think 버릇 usually has a negative connotation and 습관 has a positive connotation. Try reading the second answer in the Q&A section here: http://tip.daum.net/question/39389225. I thought it was interesting.
3 Temmuz 2015
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!