Aiko 3 and Hiro 3 can be found here
I think Aiko 3 is a limited edition here (no morphs),but Hiro 3 is a full figure. Or the other way around.
Yes, Aiko 3 is the one that needs the Morphs and Maps package, and Hiro 3 is complete in the zip file on cNet.
The answer is, it depends.
What style are you interested in? Realistic, anime, toon…?
Anime and toon
If you like the anime look but prefer Fujishima to Takahashi, you might be interested in BelBel. She’s a standalone character that was designed to be able to wear all of Aiko 3’s wardrobe.
Then there’s BelBel’s “little sister” ChibiBel, who is a stand-alone character (not an A3 morph).
I maintain a freebie list for her, too.
Many people would disagree with me, but if I were starting now using Daz Studio, I’d get the 4.5 version and focus on Genesis characters
Good advice if one is using a brand-new computer. If one’s stuck with a Pentium PC running XP, one should stick with Studio 3 and the low-poly Generation 3 figures.
Most folks will be between those extremes, of course.
Here are some freebies lists from the General Freepository. Not all of them will still be available. Check the terms of usage—usually personal renders are okay, but some may want credit.
Aiko 3 Freebies
Hiro 3 freebies
I remove “dead” links from these two lists whenever anyone points them out (or I discover them myself). I can’t speak for the maintainers of the other lists.