The very best brands/lines of polymer clay for creating fine detail and handling characteristics, etc, are Kato Polyclay and FimoClassic (not FimoSoft).
People make small objects from all brands and lines of polymer clay though, it's just that some will be better than others particularly for certain tasks. For example, Sculpey, Sculpey III, and SuperSculpey, wont' take detail *as well* and may distort or droop without armatures or support while baking, and won't be very strong in any thin areas. Craftsmart/Bakeshop are as bad as original Sculpey, I've heard. Most experienced clayers won't use those brands/lines except in certain circumstances.
You can read more about the brands and lines of polymer clay in my answer here:
https://answersrip.com/question/index?qid=20111002130625AAiDSHu )
(When you say "mold" small objects, I assume you mean shape them. Polymer clay can also be molded--in molds--so can be a little confusing).
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