In mega you get almost double download rates but files uploaded before Dec 1st 2011 will get no download rewards.

In classic you get almost half rates compared to mega but uploads made from April 1st 2011 is considered.

If you are new to filefactory choose mega. If you're uploads are mostly made between April 1st & Dec 1st 2011 then choose classic anyway sales (20%) are counted from all files regardless of upload date.