Great example the Wobble Eggs.

By email I suggested Joëlle to try with Calculate List nodes because they allow so much possibilities.

Also, using Build List I could guess it's not as powerful for larger amount of copies, for example in the joined modified WobbleEgs composition, with 200 copies, on my older MBP the Build List version bottlenecks at 30 Fps, whereas the Calculate List one stays smooth at 60 Fps.