[Jack Garcia]

Here is another:

The brindle is a young adult whereas the PEW is an adult, but that still shows basic differences. Both are American.

As Willow said, exhibition/show mice have been bred selectively for a very long time with the specific goals of improving type to fit the standards as best as possible. Pet store or hobby mice may or may not have been bred as long (depending on individual lines), but without the same goals in mind.

 

[Jack Garcia]

Yeah, some of the sweetest, most laid-back mice I've ever met have been petstore mice, but there's just something about the large, racy body and the prominent, well-designed head/face of a showier mouse that really appeals to me, too. Plus, I like owning animals that I know have had years or decades of hard work put into them (whether that work is my own or others'). In a weird way, it's like owning a piece of living history.