SCC is a tracker, but sceneaccsess is not a tracker ,it's where all the scene cappers upload their contents, they use FTP,not HTTP.So basically SCC tracker uploaders have access to those FTP dumps and servers download from there and upload on SCC.

SCT was the best tracker but they closed it down,2nd place goes to SCC,and unfortunately there is no 3rd place,Becuase all trackers comes into 3rd place since all of them are downloading from SCC and uploading to their trackers.
I have accounts almost on every tracker,and if you don't have a good [lol] at least 8mp upload speed don't think about scc, you will get only 1 minute to seed the torrent you download.