I don't think you can really choose any without playing all of them. I've played TNA and Alien but not Houdini. They all have their strengths and weaknesses. TNA is fantastic for what it is. Great light show and retro style gameplay. Alien has immersive gameplay, four flippers, and lot's of features. I really enjoyed playing it at a show bugs and all. Houdini looks to be somewhere in the middle. It just looks like a solid game with fun features and loads of details. I'm not even sure you can buy an Alien even if you wanted to. I would go with Houdini if you want more of a modern pinball experience and TNA if you like the retro/boutique thing.