I too use use another figure from before the Apocalypse so I know what you're saying.  That said, the answer is simple for me.

Support.  I loved Sadie.  Some support but not near enough.  

Support.  I still primarily use Aiko and convert.  As soon as I see an Item for Aiko 3 it's in my runtime within minutes.

Genesis 1 and 2 has some really neat stuff and a lot of support but DAZ isn't really supporting Poser as they ruined the DSON importer somehow and haven't gotten around to fixing what wasn't broke.  The New Genesis 3?  I would love using it but I wish to use it in my favorite App and that isn't happening soon.

Still, because I got on the V4 bandwagon rather late, for me, she's a wonderful figure.  So are the others and I will get them sooner or later.  I'm still wary paying a porn site to get Natu and Haru or I would get them both despite the lack of support.

As far as any war is concerned, I do wish SM and DAZ worked a little closer together for the people.  After all, Microsoft did help bail out Apple.  Don't flame me, I just mean I want to use all the figures from the Hivewire Horse (with no saddle) to Dawn to Miki to Terai Yuki to Doctor Peterbilt.  Don't limit me or force me to buy clothing I don't want so I can get a deal on clothing I do want for my figures.  And I want backward compatibility...that is something that Dawn 2 offers right now.  Suddenly I dont feel like an idiot for having spent a hundred or so in clothing that won't work on the new figure.