Both but mainly uploading awesome resources is what makes the site stand out. If one modeler was on the hive and made such unique amazing models people would always come and check his/her downloads. But if 20 people who were on the hive made ok or decent/average models you would not be as fast to click on the site. Quality over Quanity.
Besides i asked for a warcaft 2 style gryphon aviary years ago on this site and not one person respond to the post to help or make the request happen.
http://www.hiveworkshop.com/forums/requests-341/gryphon-aviary-197940/ Sad thing is my thread got closed before a response came out. I asked nicely for the request, didnt bumped, and waited 2 years and got a closed thread.
Thats why i am voting for awesome models for your question!! My answer to this post question still goes to Kwaliti ( Hives Best modeler) and/or Mr.Goblin (Hives Best artist/skinner) Hands down one of these two should win.