Quote -
On the renderers, Daz "seems" to be using the stock 3Delight engine and picking and choosing what functionality to expose inside DS.
 

Sorta. Since D|S isn't FOSS/GPL, they have to license the engine and modify it to taste, in accordance with the features they licensed, IIRC (been too damn long, so don't take the whole thing as gospel). The calls to the engine are close enough though so that you can actually use D|S with a stock 3Delight render engine and script-in a lot of the extra 'missing' functionality to that stock engine if you'd like.

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Quote - Personally I think that when you're used  to one particulair GUI, it's rather hard to learn and to appreciate another one.

Not really... I'm typing this on OSX. I use Windows at work. Windows 7 has recently gotten a lot like OSX in UI functionality, just as Poser 8 looks like it has recently gotten a lot of D|S functionality (P8 and D|S both point to Modo as their UI muse, so if you're cozy with that, you're ahead of everyone else).

Quote - But to stay one topic: the main reason I don't drop poser is the dynamic clothing

Dunno... Dynamic clothing/hair/whatever I couldn't give a flying (insert noun here) about. Too slow and clunky for my taste. OTOH, There are times when I prefer to use Poser (though joint editing is no longer one of them...)