There is an on-going rivalry between "maxis match" and "realistic" custom content styles. Maxis match is just what is sounds like; cc made in a way that looks like it was created by EA/Maxis for the g...
I use both, I go for realistic on skins and hair but i found the clothes are very hit and miss in the way they fit the sims especially if they have a different body type than the creator made them for.