We use Mercurial here. Easy, secure (ssh with keys) never forget files, small transfer size, possibility of committing regularly when the client has access to t

We use Mercurial here. Easy, secure (ssh with keys) never forget files, small transfer size, possibility of committing regularly when the client has access to the files. With hooks, the update is done as soon as the changesets are received. In some cases we can even create websites on the fly with a simple "hg clone" I guess Git allows more or less the same workflow but Mercurial is easier for your designers.