gamestudio free | unity free
---------------------------------------------
permanent watermark | startup logo only
no shaders (ffp effects tho) | shaders (only included ones)
PLUGIN ABILITY | NO PLUGIN ABILITY WHATSOEVER
EASY C LIBRARY INTEGRATION |NO LIBRARY INTEGRATION
ode | physx<(only)
^(or many other opensource plugins that can or have been made)
no bone weights | bone weights
no multiplayer | unlimited multiplayer <(only option for multiplayer)
^(although tons of networking plugins that are great)
WED | a nice editor
windows | windows, osx, webplayer
...