No difference I've heard. I chose deploy client. I finally had a chance to play it just now. Seemed pretty ok gameplay, nice sound effects despite imo horrible gfx, very low fps, jerky animations. I had to try about 15 servers before I was able to play. The game often crashes in the menus and the interface is very sluggish. It seems the devs have allowed everyone to join multiplayer - No need to complete any training anymore.