you left out all of the above and none of the above...
I'm sure somepeople use outdoor enclosures, while others might use more than one method...
Like me - I use Viv's and racks....
1.1 G. Ulikovskii - viv
1.1 G. Vitattus - viv
1.2.4 E. Macularious - viv & rack both
1.1 L. Alterna - viv
21.21 E.G. Gutatta - viv and rack both
?.? mice in glass aquariums
2.2 rats in cages
^Curtis