personally i think getting it as a baby is nicer you appreciate its life alot more (IMO). I remember when I got my guy 4 months old and like 10 inches...now he is over 3ft and just turned a year old. Watched him go from little mice to rats...but watching it grow is something i like...but that is just me...
bad analogy but...would you want teenage kids or would you like to see ur kids walk and talk for the first time?
Note: I have only had one...answer might be a little biased.