大家好 is used to start a speech.or introduce urself etc.
你们好 means u are meeting more than one people and u want to say hello to them.
2015年3月6日
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大家 everyone, 你们 you(plural)
Basically it means the same thing in greeting, just like the difference between hello and hi?
↖(^ω^)↗
2015年3月6日
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大家好 dajia hao ,, dajia means everyone , "Hello, everyone"
你们好 nimen hao nimen is plural YOU , "Hello you guys "
In fact it is just 2 different ways to convey the same message , a greeting !