Quote - Hey, absolutely nothing pro or against Antonia.. Certainly not.
But WHY do people choose to use a certain figure for a certain job?

For me, it's mostly because of the way they look.  I'm going for a certain "look," whether it's matching a description in a book, or looking like an actual person, or a certain style (toon, anime, etc.).  Often it comes down to what morphs, textures, and clothes are available (and what I have).  Sure, I could make my own morphs and convert clothing, but it's easier if I don't have to. 

There's also a matter of familiarity.  If you use a figure a lot, you become very adept at posing, morphing, and lighting it. 

As for high vs. low-res...unless it's really quick and dirty render, or an animation, I usually use the higher-res figures.  Sometimes you change your mind, and want a different pose/closer shot.  Sometimes the image is one of series, and it's not worth the hassle of setting up two figures, one high res and one low.