Quoting P Pickle Pants:" The 120 is the best IMO! Has the high weight limit but allows for taller kids (vs thicker) because the ... [snip!] ... seat. You could probably do fine with the 100 if your kids are very small for their age, but the extra 20lbs is worth it IMO"
Quoting P Pickle Pants:" <blockquote><b>Quoting Baking #3 *21weeks*:</b>" Nevermind, I see it now. Booster. ... [snip!] ... Booster. Is that the only difference?"</blockquote> The r100 isn't as good for news. Less padding/contouring, IMO."