Before you answer this question, hear what I have to say, eh?
For years I've been a hardcore Nintendo fan, ever since I got an NES from my late uncle in the early 90s. Favoring the SNES over the Sega Genesis later on as well as the Nintendo 64 being my all-time favorite system, and being a supporter of Nintendo's handheld from the original GameBoy to the Nintendo DS: I always thought Nintendo did good for this industry.
Up until recently Nintendo has been having a difficult time selling Wii hardware and Wii software, having the console to "stall" at this point. A few people claimed that the Wii may outsell the PS2's lifetime sales, but Sony's successor to the PSX has a worldwide sales count of 140 million units. Even though Nintendo broke records in game sales and being one of the most innovative publishers on the planet, as far as I'm concerned, I am dissapointed in the lack of good games third party developers have created, thus drifting me away from getting a game for the Wii (in fact, I haven't even bought a new game in over a year for the Wii!).
Since my purchase of the 360, I've played that console more than the Wii and DS combined. But the only thing that kept me away from Microsoft's system is their online service. I don't want to pay extra for online gaming. It's like a gaming divserified system (Silver not getting online play whereas Gold has everything else), even though I hardly play online games, but you get what I mean.
But ever since I purchased a PS3, I've been playing on Sony's system more than 360 at the moment. I do plan on getting games like Demon's Souls and Arkham Asylum in the future (if I can afford it). So far I only play LBP, a few PS1 games, and PlayStation Home (and some demos here and there), and I want to expand my library for this console.
Even though I'm a hardcore Nintendo fan, in this gaming generation I have to yield their support due to lack of good quality software. But that's not stopping me from not playing on their systems (my primary reason for the Wii is c1assic games, and I still play those games on the Wii), I once in a while play a game on the Wii here and there.
Even though I like Microsoft's many options on content (games, movies, TV, music, etc.), in this generation I have to give my support to Sony. What are my reasons why I prefer Sony over the other two, you ask? I believe they have potential to succeed ever since they changed their marketing strategy when they released the newer model of the PS3 as well as forcing Microsoft and Nintnedo (and probably scaring them too) to compete with their demands.
Now that you know who I'm supporting in this gaming generation, who are you rooting for? Sony? Microsoft? Nintendo? Let your typing be heard 
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See Ya!