RARed for sure. That way I know its error free because it wouldn't have extracted otherwise.
Space wise I wouldn't use the files out of the download location on my seedbox. So it always takes double space anyway.
Plus its not that much work.. I DL allot at once.
Open one of the rar, navigate up a folder to your download folder and have it sorted by date. select all your newest download folders and hit extract, pick folder. all done at once.