burnout driers

in my experience it seems there are two schools of thought when choosing the correct size of burnout drier for a system.one being that the b/out drier should be one size up from the suction line.the other being that the drier connection need only be the same as the suction line.which is,and preferably backed up with an explanation, correect?
when i say next size up, i mean in capacity aswell.

Sporlan have their ideas in this document, go up a size or early replacement, etc.

http://sporlan.jandrewschoen.com/80-10.pdf

Also, pick one of these...
http://sporlan.jandrewschoen.com/catchalls.shtm