Someone who DA makes that decision that they no longer want to associate with the congregation which is the b/s. Most brothers would be curious as to why, and probably would love to ask you why. I think a person that DA is worst than one that is DF, disfellowshipping leaves the door open to come back on the other hand the DA person deliberatly leaves so not likely to want to come back.
A lot of questions why someone DA themselves, could be because they were doing wrong and didn't want to get DF, or for them realised was not the truth....or was shaken by the hypocrocy of the tower and GB.
For me people are people regardless of DA or DF, but I guess that is what most would think.