Ferret: You find the antics a bit hyper, as it is a relatively hyperactive animal when it comes to playing, but sleeps equally often as well
. Smells quite strong too. Get used to the odour if you keep one.....
Guinea pig: Nice sized, odour negligible, buy the KT brand guinea pig pellets for feed, also alfalfa and other hay mixes, grooming wise not needed for short haired guineas.
Now Marvin you decide :D