我們and 咱們 both mean we and us. I think 咱們 is usually used by men, it sounds a bit rough to me. ((Like used between close male friends) Perhaps in mainland china is used differently and it's acceptable and common used by women as well but I would like in formal situations it would be better to stick to 我們。that's my two cents, hopefully it helps.
March 11, 2014
totally smilar,but there is a difference,for example,if you tell A that you and B went to the hospital,you can say 我们去医院了，but you cannot say 咱们去医院了，because 咱们means”you andB“（you and the person with you）in this sentence.
April 13, 2014
“咱们”北方人用的多，比较Justice，helpful，很man 的感觉。“我们”is common speaking。
March 12, 2014
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