Portal Knights vs Sky Force Anniversary
Portal Knights
Portal Knights brings an epic 3D sandbox adventure to your screens with a huge variety of game maps and portals to travel through. You can choose your character from three classes: warrior, mage and ranger. The game brings an open world map where you are free to let your imaginations run wild. Explore the worlds, craft items and build anything you can imagine. You also get to explore beautiful biomes, most of which hides secrets that you can try to find, as you hop from world to world. The game even features a multiplayer mode with up to four players playing co-op or two players in a split screen game as you all try to build your very own world from scratch.Portal Knights features amazing animated graphics and a really addicting RPG play. If you are a fan of sandbox adventures like Minecraft, this is the perfect pick for you.
Sky Force Anniversary
Sky Force Anniversary brings Sky Force to platforms other than Android and iOS, namely PC and consoles, allowing even more players to enjoy its exhilarating arcade shooting action. It is basically similar to Sky Force 2014 on mobile and features everything you'd expect to find in the latter, including challenging enemies and bosses, large number of missions, weekly PvP tourneys, an in-depth airplane upgrade system along with a wide variety of planes to fly as and weapons to blast enemies into smithereens. In this version, you can also play the game cooperatively with a friend through the game's local multiplayer option.Oddly enough, despite its similarities to Sky Force 2014, Sky Force Anniversary is available on Android as well. Unfortunately, I'm pretty sure the game doesn't support cross-platform cooperative gameplay so you can't exactly play with your friend cooperatively if he is on the PC and you on your phone.
Sky Force Anniversary is the best (and only) version of Sky Force that you can get for Nintendo Wii, PlayStation (3, 4 and Vita), and Xbox Live, but if you want to play the game on your mobile, you can get either the Anniversary version (Android only) or the 2014 version.