handling multiple autoblogs

i know how to backup a wp database for cloning etc. but i missing the big picture on multidomainhosting and scaling it up lets see how if i uinderstand it right and if there are better methods:
method A:
- get a account on host and buy domains
- make subdirectories at samplehost.com
samplehost.com/blog1
samplehost.com/blog2
...
link domain 1 to samplehost.com/blog1 etc..
- copy wordpresss to each diretory

method B
- get a account on host and buy domains
- make subdirectories at samplehost.com
samplehost.com/blog1
...
link domain 1 to samplehost.com/blog1 etc..
-use wp mu instead of copying wp to each dir...

whic method do you use and why?

the answer all depends on what you are trying to do. the only real benefit of MU is allowing multiple users and blogs from one install. So you have admin control over all the blogs but by default you would still have to go to each sub blog, login and post content. They have plugins that allow you to post from the "master" blog but beyond that there is no real advantage in my opinion. Also MU doesnt support all of the plugins that regular WP does.