BioShock vs Crysis Warhead
BioShock
BioShock is one of the most highly acclaimed steampunk-themed shooters that has a very interesting twist - your very character's DNA can be modified through the use of a selection of plasmids and a special resource called ADAM, allowing you to have superhuman abilities which will serve you well, sometimes more so than the weapon you wield, in your adventure through the fallen underwater city of Rapture. Aside from the many violent mad men (a.k.a. Splicers), the game also provides players with challeging encounters with the iconic Big Daddies and Little Sisters.When it comes to non-military-styled shooters with an intensely immersive storyline, BioShock is among the handful of the "best of the best" (which includes the Fallout series, the Borderlands series, the Deus Ex series and others). The game boasts of having a rather dark storyline that actually challenges you to think about it in a more in-depth way; to link all the clues together to get the complete narrative that is surprisingly a lot more engaging that you'd expect.
2K Games has just released the remastered version of the very first Bioshock last year and if you can get it on Steam, you really should. The very unique experience it can offer you is very well worth the cost.
Crysis Warhead
Crysis Warhead is somewhat like a spin-off mainly because it doesn't really continue the plotline in the main Crysis franchise. Instead, I'd venture as far to say that this game might be a prequel to the original Crysis... maybe? Anyway, in this game, you play as Sergeant Sykes who find hismelf on a life-risking mission to retrieve a cargo that's incredibly important behind enemy lines during the Korean war. The gameplay in this game is amazing visceral and intuitive, and of course, between the suit's abilities and the wide range of weapons, you'll have multiple methods to take out your enemies and walk away smiling.There are also aliens of course - it's just Crysis being Crysis - but the enemy AI is a whole lot more intelligent and may just catch you off guard if you're not careful.
As great as Crysis Warhead is, the game can be a tad bit short for its full price. However, if you can get it during a promotion, the game will be very well worth the experience, the time and the price.