I'm still learning/discovering the new 2014 games. For me, there's a fairly vast jump going from 2011 to 2014 software --- lots of new titles/sequels. Overall, though, the same general games still get the most play. For groups/parties where several people are playing, I'd say Photo Hunt, Trivia (all types), Little Shop of Treasures, etc. With the newer games, Photo Hunt Expedition, Beer Pong, Skeeball, and a few others.
As for games that I (and others) enjoy playing solo, that list is quite long. I have a thread I started where I've been posting videos of my favorite games. Here's the thread:
http://forums.arcade-museum.com/showthread.php?t=383031
Keep in mind that these videos I've been posting were recorded a couple months ago on my Force Radion 2011, right before I got my Evo and updated it to 2014. But after playing the 2014 software, I can say that most of the games I play the most are still the same, with some new additions. I'll be recording new videos of those newer games once I finish posting all of these videos.
Since my Evo is relatively new, everyone (including myself) is still discovering games, so it'll take me some time before I have some definite favorites. Some of the joystick games (Triple Crown Boxing, Beer Pong, Space Crusader, Luxor 2, etc) are a lot of fun and I really like the new Photo Hunt Expedition games, which are similar to Little Shop of Treasures. The newer, classic Photo Hunt is cool too, and is a bit faster, which I like. But yeah...SO many games to try out and get familiar with!