a mouse is smarter because they can solve problems and hamsters just sleep most of the time
No, hamsters are territorial, the hamster will kill the mouse.
A Gerbil or a Hamster.
Hamster
the mouse
No, mixing different species is not recommended and may end up in the death of the mouse or hamster, or both. The hamster could also chew off the mouse's tail.
I think a dwrf mouse
Depending on the cage, some of the cleverer ones figure out how to open the door, or push out their foodbowls and leave through the small entrance.
A hamster because they are cute
Yes They Are
No, they are different species.
No, a hamster has a very short tail.
Hamster because mice stink and hamster like to play more than mice. If you want a playful pet choose hamster an if you want a pet that will just sit around in the cage then the mouse is for you!