It really depends on what you're looking for. AGS is really great for oldschool adventures and there are many plungins, modules, starterpacks avaliable to build on and it has a big community where you'll find help if any problems come up. If you want to make a low resolution game, AGS is good choice. But at the moment the limit for AGS is 1024x768, so Wintermute and Visionaire have some advantages when working with higher resolutions. As far as I know Daedalic Entertainment used Visionaire for some of their games, so you can look at "The Whispered World" or "Deponia" to get a feeling how Vis-Games look like.